SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                         MARTIN MARIETTA MATERIALS, INC.
                                (Name of Issuer)

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
                         (Title of Class of Securities)

                                    573284106
                                 (CUSIP Number)

                               SPO Advisory Corp.
                         591 Redwood Highway, Suite 3215
                          Mill Valley, California 94941
                                 (415) 383-6600

                                 with a copy to:

                                Alison S. Ressler
                             Sullivan & Cromwell LLP
                             1888 Century Park East
                       Los Angeles, California 90067-1725
                                 (310) 712-6600

           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                               SEPTEMBER 25, 2007
             (Date of Event which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box [_].

Note. Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).



                                                              Page 1 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         SPO Partners II, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 3,112,300 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 3,112,300 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,112,300
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.4%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SPO Advisory Partners,
    L.P.



CUSIP No. 573284106                                           Page 2 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         SPO Advisory Partners, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 3,112,300 (1)(2)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 3,112,300 (1)(2)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,112,300
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.4%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.



CUSIP No. 573284106                                           Page 3 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         San Francisco Partners II, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         California
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 147,800 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 147,800 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         147,800
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.4%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Power is exercised through its sole general partner, SF Advisory Partners,
    L.P.



CUSIP No. 573284106                                           Page 4 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         SF Advisory Partners, L.P.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 147,800 (1)(2)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 147,800 (1)(2)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         147,800
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         0.4%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         PN
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of San Francisco
    Partners II, L.P.
(2) Power is exercised through its sole general partner, SPO Advisory Corp.



CUSIP No. 573284106                                           Page 5 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         SPO Advisory Corp.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         Delaware
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 3,260,100 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 3,260,100 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,260,100
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.8%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         CO
--------------------------------------------------------------------------------

(1) Solely in its capacity as the sole general partner of SPO Advisory
    Partners, L.P. with respect to 3,112,300 of such shares; and solely
    in its capacity as the sole general partner of SF Advisory Partners, L.P.
    with respect to 147,800 of such shares.

(2) Power is exercised through its three controlling persons, John H. Scully,
    William E. Oberndorf and William J. Patterson.



CUSIP No. 573284106                                           Page 6 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         John Scully
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         PF and Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 35,800 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              3,260,100 (2)
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 35,800 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 3,260,100 (2)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,295,900
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.9%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) Of these shares, 600 shares are held in the John H. Scully Individual
    Retirement Accounts, which are self-directed, and 35,200 shares may be
    deemed to be beneficially owned by Mr. Scully solely in his capacity as
    controlling person, sole director and executive officer of Phoebe Snow
    Foundation, Inc.

(2) These shares may be deemed to be beneficially owned by Mr. Scully solely
    in his capacity as one of three controlling persons of SPO Advisory Corp.



CUSIP No. 573284106                                           Page 7 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         William E. Oberndorf
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 -0-
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              3,260,100 (1)
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 -0-
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 3,260,100 (1)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,260,100
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.8%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) These shares may be deemed to be beneficially owned by Mr. Oberndorf solely
    in his capacity as one of three controlling persons of SPO Advisory Corp.



CUSIP No. 573284106                                           Page 8 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         William J. Patterson
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         Not Applicable
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         USA
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 100 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              3,261,800 (2)
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 100 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 3,261,800 (2)
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         3,261,900
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         7.8%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         IN
--------------------------------------------------------------------------------

(1) These shares are held in the William J. Patterson Individual Retirement
    Account, which is self directed.

(2) Of these shares, 3,260,100 shares may be deemed to be beneficially owned by
    Mr. Patterson solely in his capacity as one of three controlling persons of
    SPO Advisory Corp. and 1,700 shares may be deemed to be beneficially owned
    by Mr. Patterson solely in his capacity as a controlling person, director
    and executive officer of The Elizabeth R. & William J. Patterson Foundation.


CUSIP No. 573284106                                           Page 9 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         Phoebe Snow Foundation, Inc.
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         California
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 35,200 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 35,200 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         35,200
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         **0.1%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         CO
--------------------------------------------------------------------------------
** Denotes less than.

(1) Power is exercised through its controlling person, sole director and
    executive officer, John H. Scully.


CUSIP No. 573284106                                          Page 10 of 53 pages

--------------------------------------------------------------------------------
1.       NAME OF REPORTING PERSON
         The Elizabeth R. & William J. Patterson Foundation
--------------------------------------------------------------------------------
2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:           (a)     [_]
                                                                     (b)     [X]
--------------------------------------------------------------------------------
3.       SEC Use Only
--------------------------------------------------------------------------------
4.       SOURCE OF FUNDS
         WC
--------------------------------------------------------------------------------
5.       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
         ITEMS 2(e) OR 2(f) [_]
--------------------------------------------------------------------------------
6.       CITIZENSHIP OR PLACE OF ORGANIZATION
         California
--------------------------------------------------------------------------------
                          7.     SOLE VOTING POWER
                                 1,700 (1)
                          ------------------------------------------------------
  NUMBER OF SHARES        8.     SHARED VOTING POWER
 BENEFICIALLY OWNED              -0-
 BY EACH REPORTING        ------------------------------------------------------
     PERSON WITH          9.     SOLE DISPOSITIVE POWER
                                 1,700 (1)
                          ------------------------------------------------------
                          10.    SHARED DISPOSITIVE POWER
                                 -0-
--------------------------------------------------------------------------------
11.      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         1,700
--------------------------------------------------------------------------------
12.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
         SHARES [_]
--------------------------------------------------------------------------------
13.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         **0.1%
--------------------------------------------------------------------------------
14.      TYPE OF REPORTING PERSON
         CO
--------------------------------------------------------------------------------
** Denotes less than.

(1) Power is exercised through its controlling persons, directors and executive
    officers, William J. Patterson and Elizabeth R. Patterson.


                                                             Page 11 of 53 pages

         This Amendment No. 1 amends the Schedule 13D (the "Original 13D") filed
with the Securities and Exchange Commission ("SEC") on August 10, 2007. Unless
otherwise stated herein, the Original 13D, as previously amended, remains in
full force and effect. Terms used therein and not defined herein shall have the
meanings ascribed thereto in the Original 13D.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         The source and amount of the funds used or to be used by the Reporting
Persons to purchase Shares are as follows:

NAME                      SOURCE OF FUNDS                     AMOUNT OF FUNDS
----------------------    ----------------------------------  ------------------
SPO                       Contributions from Partners             $390,648,094
SPO Advisory Partners     Not Applicable                         Not Applicable
SFP                       Contributions from Partners             $18,454,695
SF Advisory Partners      Not Applicable                         Not Applicable
SPO Advisory Corp.        Not Applicable                         Not Applicable
JHS                       Not Applicable and Personal Funds         $79,309
WEO                       Not Applicable                         Not Applicable
WJP                       Not Applicable and Personal Funds         $12,572
PS Foundation             Contributions from Shareholders          $4,582,420
Patterson Foundation      Contributions from Shareholders           $221,740


(1)  As used herein, the term "Personal Funds" includes sums borrowed from banks
     and brokerage firm margin accounts, none of which were borrowed or
     otherwise obtained for the specific purpose of acquiring, holding, trading
     or voting Shares.

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

         (a) Percentage interest calculations for each Reporting Person are
based upon the Issuer having 41,796,336 total outstanding shares of common stock
as reported on the Issuer's 10-Q filed with the Securities and Exchange
Commission on August 7, 2007.

         SPO

         The aggregate number of Shares that SPO owns beneficially, pursuant to
Rule 13d-3 of the Act, is 3,112,300 Shares, which constitutes approximately
7.4% of the outstanding Shares.

         SPO Advisory Partners

         Because of its position as the sole general partner of SPO, SPO
Advisory Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the
beneficial owner of 3,112,300 Shares, which constitutes approximately 7.4% of
the outstanding Shares.

         SFP

         The aggregate number of Shares that SFP owns beneficially, pursuant to
Rule 13d-3 of the Act, is 147,800 Shares, which constitutes approximately 0.4%
of the outstanding Shares.


                                                             Page 12 of 53 pages

         SF Advisory Partners

         Because of its position as the sole general partner of SFP, SF Advisory
Partners may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial
owner of 147,800 Shares, which constitutes approximately 0.4% of the
outstanding Shares.

         SPO Advisory Corp.

         Because of its positions as the sole general partner of each of SPO
Advisory Partners and SF Advisory Partners, SPO Advisory Corp. may, pursuant to
Rule 13d-3 of the Act, be deemed to be the beneficial owner of 3,260,100 Shares
in the aggregate, which constitutes approximately 7.8% of the outstanding
Shares.

         JHS

         Individually, and because of his positions as a control person of SPO
Advisory Corp. and the and controlling person, sole director and executive
officer of PS Foundation, JHS may, pursuant to Rule 13d-3 of the Act, be deemed
to be the beneficial owner of 3,295,900 Shares, which constitutes approximately
7.9% of the outstanding Shares.

         WEO

         Because of his positions as a control person of SPO Advisory Corp., WEO
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
3,260,100 Shares in the aggregate, which constitutes approximately 7.8% of the
outstanding Shares.

         WJP

         Because of his position as a control person of SPO Advisory Corp. and a
controlling person, director and executive officer of Patterson Foundation, WJP
may, pursuant to Rule 13d-3 of the Act, be deemed to be the beneficial owner of
3,261,900 Shares in the aggregate, which constitutes approximately 7.8% of the
outstanding Shares.

         PS Foundation

         The aggregate number of Shares that PS Foundation owns beneficially,
pursuant to Rule 13d-3 of the Act, is 35,200 Shares, which constitutes
less than 0.1% of the outstanding Shares.

         Patterson Foundation

         The aggregate number of Shares that Patterson Foundation owns
beneficially, pursuant to Rule 13d-3 of the Act, is 1,700 Shares, which
constitutes less than 0.1% of the outstanding Shares.

         To the best of the knowledge of each of the Reporting Persons, other
than as set forth above, none of the persons named in Item 2 hereof is the
beneficial owner of any Shares.

         (b) SPO

         Acting through its sole general partner, SPO has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 3,112,300
Shares.


                                                             Page 13 of 53 pages

         SPO Advisory Partners

         Acting through its sole general partner and in its capacity as the sole
general partner of SPO, SPO Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 3,112,300 Shares.

         SFP

         Acting through its sole general partner, SFP has the sole power to vote
or to direct the vote and to dispose or to direct the disposition of 147,800
Shares.

         SF Advisory Partners

         Acting through its sole general partner and in its capacity as the sole
general partner of SFP, SF Advisory Partners has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 147,800 Shares.

         SPO Advisory Corp.

         Acting through its controlling persons and in its capacities as the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
SPO Advisory Corp. has the sole power to vote or to direct the vote and to
dispose or to direct the disposition of 3,260,100 Shares in the aggregate.

         JHS

         As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
JHS may be deemed to have shared power with WEO and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 3,260,100 Shares held by SPO
and SFP in the aggregate. In addition, JHS has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 600 Shares held
in the John H. Scully Individual Retirement Accounts, which are self-directed
individual retirement accounts, and 35,200 Shares held by the PS Foundation, for
which JHS is the controlling person, sole director and executive officer.

         WEO

         As one of three controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WEO may be deemed to have shared power with JHS and WJP to vote or to direct the
vote and to dispose or to direct the disposition of 3,260,100 Shares held by SPO
and SFP in the aggregate.

         WJP

         As one of the controlling persons of SPO Advisory Corp., which is the
sole general partner of each of SPO Advisory Partners and SF Advisory Partners,
WJP may be deemed to have shared power with JHS and WEO to vote or to direct the
vote and to dispose or to direct the disposition of 3,260,100 Shares held by SPO
and SFP in the aggregate. WJP may be deemed to have shared power to vote or to
direct the vote and to dispose or to direct the disposition of 1,700 Shares held
by the Patterson Foundation. In addition, WJP has the sole power to vote or to
direct the vote and to dispose or to direct the disposition of 100 Shares held
in the William J. Patterson Individual Retirement Account, which is a self-
directed individual retirement account.


                                                             Page 14 of 53 pages

         PS Foundation

         Acting through its controlling person, PS Foundation has the sole power
to vote or to direct the vote and to dispose or to direct the disposition of
35,200 Shares.

         Patterson Foundation

         Acting through its two controlling persons, directors and executive
officers, Patterson Foundation has the sole power to vote or to direct the vote
and to dispose or to direct the disposition of 1,700 Shares.

         (c) Since August 10, 2007, Reporting Persons purchased Shares in open
market transactions on the New York Stock Exchange as set forth on Schedule I
attached hereto.

         Except as set forth in this paragraph (c), to the best of the knowledge
of each of the Reporting Persons, none of the persons named in response to
paragraph (a) has effected any transactions in Shares during the past 60 days.

         (d) Each of the Reporting Persons affirms that no person other than
such Reporting Person has the right to receive or the power to direct the
receipt of distributions with respect to, or the proceeds from the sale of,
Shares owned by such Reporting Person.

         (e) Not applicable.

ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.

Exhibit A:  Agreement pursuant to Rule 13d-1 (k)

                                                             Page 15 of 53 pages


                                    SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.



Dated September 27,2007                     By:     /s/ Kim M. Silva
                                               --------------------------------
                                                   Kim M. Silva

                                           Attorney-in-Fact for:

                                           SPO PARTNERS II, L.P.(1)
                                           SPO ADVISORY PARTNERS, L.P.(1)
                                           SAN FRANCISCO PARTNERS II, L.P.(1)
                                           SF ADVISORY PARTNERS, L.P.(1)
                                           SPO ADVISORY CORP.(1)
                                           JOHN H. SCULLY(1)
                                           WILLIAM E. OBERNDORF(1)
                                           WILLIAM J. PATTERSON(1)
                                           PHOEBE SNOW FOUNDATION, INC.(1)
                                           THE ELIZABETH R. & WILLIAM J.
                                              PATTERSON FOUNDATION(1)


                                           (1) A Power of Attorney
                                           authorizing Kim M. Silva to
                                           act on behalf of this
                                           person or entity is filed as
                                           Exhibit B.



                                                                                          Page 16 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/15/2007       Buy          277       124.8600       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          830       124.8800       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          461       124.9000       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          184       124.9100       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy           92       124.9200       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          461       124.9400       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          277       124.9500       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          554       124.9700       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          185       124.9800       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy          369       124.9900       Open Market/Broker
SPO Partners II, L.P.                 8/15/2007       Buy        9,410       125.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           15       124.8600       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           44       124.8800       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           25       124.9000       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           10       124.9100       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy            5       124.9200       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           25       124.9400       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           15       124.9500       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           29       124.9700       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy            9       124.9800       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy           20       124.9900       Open Market/Broker
San Francisco Partners II, L.P.       8/15/2007       Buy          503       125.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy            8       124.8600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy           26       124.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy           14       124.9000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy            6       124.9100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy            3       124.9200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy           14       124.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy            8       124.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy           17       124.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy            6       124.9800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy           11       124.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/15/2007       Buy          287       125.0000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          204       116.7600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       116.7800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        2,037       116.8709       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       116.9600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        8,686       117.0000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        3,334       117.2839       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       117.6750       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       117.6900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        2,500       117.7000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          833       117.7189       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       117.7400       Open Market/Broker




                                                                                          Page 17 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/16/2007       Buy        2,130       117.7500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        3,704       117.7600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,482       117.7900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       117.8000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          266       117.8700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,482       117.8731       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       117.8800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       117.9200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       117.9300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          556       117.9350       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          290       117.9429       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       117.9957       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       118.0000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.0700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.0900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,388       118.1727       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          462       118.1800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.2000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       118.2900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.3200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.3500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.3800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.3900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.4100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       118.6000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       118.6500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.6600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.6800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.6900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          926       118.7000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.8200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.8500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       118.8600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           22       118.8700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          556       118.8800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       118.9000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          348       118.9100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       118.9200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       118.9300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.9400       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.9500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       118.9600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       118.9900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          741       119.0000       Open Market/Broker




                                                                                          Page 18 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/16/2007       Buy          185       119.0100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.0200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.0600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.0900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.1100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          741       119.2000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          462       119.2600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.2800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.3000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          556       119.3100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.3200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.3300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          464       119.3600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.3700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,021       119.3800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,019       119.3900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          462       119.4000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.4100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       119.4200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.4300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          463       119.4400       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          463       119.4700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.4800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       119.4900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.5300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          926       119.5500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          741       119.5600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,574       119.5824       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.5900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.6000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          463       119.6100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.6200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          648       119.6500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.6600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.6700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          926       119.6800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.6900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          926       119.7000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.7100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          556       119.7300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          833       119.7400       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.7500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.7600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.7700       Open Market/Broker




                                                                                          Page 19 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/16/2007       Buy        1,945       119.7800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.7900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.8000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          417       119.8100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,482       119.8200       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        2,264       119.8300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          370       119.8400       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       119.8500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy           93       119.8600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,204       119.8700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          463       119.8800       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.9000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          741       119.9100       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          833       119.9300       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.9400       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,111       119.9500       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          741       119.9600       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       119.9900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        7,315       120.0000       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,667       120.7083       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,296       121.4700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       121.6950       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,296       121.8593       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,389       121.8960       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,759       121.9211       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,852       121.9225       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          185       122.5900       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy          278       122.9700       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        1,111       123.6142       Open Market/Broker
SPO Partners II, L.P.                 8/16/2007       Buy        2,037       123.7995       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           11       116.7600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       116.7800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          108       116.8709       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       116.9600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          460       117.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          176       117.2839       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       117.6750       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       117.6900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          132       117.7000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           44       117.7189       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       117.7400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          113       117.7500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          196       117.7600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           78       117.7900       Open Market/Broker




                                                                                          Page 20 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

San Francisco Partners II, L.P.       8/16/2007       Buy            5       117.8000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           14       117.8700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           78       117.8731       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       117.8800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       117.9200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       117.9300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           29       117.9350       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       117.9429       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       117.9957       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       118.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.0700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.0900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           74       118.1727       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           25       118.1800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.2000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       118.2900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.3200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.3500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.3800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.3900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.4100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       118.6000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       118.6500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.6600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.6800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.6900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           49       118.7000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.8200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.8500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       118.8600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            1       118.8700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           29       118.8800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       118.9000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           18       118.9100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       118.9200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       118.9300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.9400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.9500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       118.9600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       118.9900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           39       119.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.0100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.0200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.0600       Open Market/Broker




                                                                                          Page 21 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.0900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.1100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           39       119.2000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           25       119.2600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.2800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.3000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           29       119.3100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.3200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.3300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           25       119.3600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.3700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           54       119.3800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           54       119.3900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           25       119.4000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.4100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       119.4200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.4300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           24       119.4400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           24       119.4700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.4800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       119.4900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.5300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           49       119.5500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           39       119.5600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           83       119.5824       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.5900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.6000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           24       119.6100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.6200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           34       119.6500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.6600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.6700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           49       119.6800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.6900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           49       119.7000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.7100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           29       119.7300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           44       119.7400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.7500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.7600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.7700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          103       119.7800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.7900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.8000       Open Market/Broker




                                                                                          Page 22 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

San Francisco Partners II, L.P.       8/16/2007       Buy           22       119.8100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           78       119.8200       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          120       119.8300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           20       119.8400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           10       119.8500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            5       119.8600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           64       119.8700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           24       119.8800       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.9000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           39       119.9100       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           44       119.9300       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.9400       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           59       119.9500       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           39       119.9600       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           15       119.9900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          386       120.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           87       120.7083       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           68       121.4700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            9       121.6950       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           68       121.8593       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           73       121.8960       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           92       121.9211       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           97       121.9225       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy            9       122.5900       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           14       122.9700       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy           59       123.6142       Open Market/Broker
San Francisco Partners II, L.P.       8/16/2007       Buy          108       123.7995       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       116.7600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       116.7800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           53       116.8709       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       116.9600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy          225       117.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           86       117.2839       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       117.6750       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       117.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           65       117.7000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           22       117.7189       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       117.7400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           55       117.7500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           96       117.7600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           38       117.7900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       117.8000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       117.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           38       117.8731       Open Market/Broker




                                                                                          Page 23 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       117.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       117.9200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       117.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           14       117.9350       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            8       117.9429       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       117.9957       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       118.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.0700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.0900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           36       118.1727       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       118.1800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.2000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       118.2900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.3200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.3500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.3800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.3900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.4100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       118.6000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       118.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.6800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           24       118.7000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.8200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.8500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       118.8600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            1       118.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           14       118.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       118.9000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       118.9100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       118.9200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       118.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       118.9600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       118.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           19       119.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.0100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.0200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.0600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.0900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.1100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           19       119.2000       Open Market/Broker




                                                                                          Page 24 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.2600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.2800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.3000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           14       119.3100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.3200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.3300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.3600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.3700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           27       119.3800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           26       119.3900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.4000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.4100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       119.4200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.4300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.4400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.4700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.4800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       119.4900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.5300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           24       119.5500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           19       119.5600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           41       119.5824       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.5900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.6000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.6100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.6200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           17       119.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.6700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           24       119.6800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           24       119.7000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.7100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           14       119.7300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           22       119.7400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.7500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.7600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.7700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           50       119.7800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.7900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.8000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           11       119.8100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           38       119.8200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           59       119.8300       Open Market/Broker




                                                                                          Page 25 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/16/2007       Buy           10       119.8400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       119.8500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            2       119.8600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           31       119.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           12       119.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.9000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           19       119.9100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           22       119.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           29       119.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           19       119.9600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       119.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy          191       120.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           44       120.7083       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           34       121.4700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       121.6950       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           34       121.8593       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           36       121.8960       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           46       121.9211       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           48       121.9225       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            5       122.5900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy            7       122.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           29       123.6142       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/16/2007       Buy           53       123.7995       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       116.8709       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            9       117.0000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            4       117.2839       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            3       117.7000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       117.7189       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       117.7500       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            4       117.7600       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       117.7900       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       117.8731       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       117.9350       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       117.9957       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       118.1727       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       118.1800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       118.7000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       118.8600       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       118.8800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       118.9300       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.0000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.2000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.2600       Open Market/Broker




                                                                                          Page 26 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.3100       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.3600       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.3800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.3900       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.4000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.4200       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.4400       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.4700       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.4900       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.5500       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.5600       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       119.5824       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.6100       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.6500       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.6800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.7000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.7300       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.7400       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       119.7800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       119.8200       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       119.8300       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.8700       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.8800       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.9100       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.9300       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.9500       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       119.9600       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            8       120.0000       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       120.7083       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       121.4700       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       121.6950       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       121.8593       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            2       121.8960       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            3       121.9211       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            3       121.9225       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       122.5900       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       122.9700       Open Market/Broker
The Elizabeth R. and William J.
Patterson Foundation                  8/16/2007       Buy            1       123.6142       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/16/2007       Buy            2       123.7995       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy        4,531       123.5606       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy        3,236       124.6580       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy        3,884       124.8029       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy          277       124.9200       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy          925       124.9420       Open Market/Broker




                                                                                          Page 27 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/17/2007       Buy          185       124.9700       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy           92       125.0000       Open Market/Broker
SPO Partners II, L.P.                 8/17/2007       Buy          370       125.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy          235       123.5606       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy          168       124.6580       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy          201       124.8029       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy           14       124.9200       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy           48       124.9420       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy           10       124.9700       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy            5       125.0000       Open Market/Broker
San Francisco Partners II, L.P.       8/17/2007       Buy           19       125.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy          134       123.5606       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy           96       124.6580       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy          115       124.8029       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy            9       124.9200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy           27       124.9420       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy            5       124.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy            3       125.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/17/2007       Buy           11       125.0000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       123.9700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.0800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.1000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.2000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.2300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.2800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.2900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.3000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.3500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.3600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.3700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           98       124.4200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.4300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.4400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.5000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.5100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.5200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.5400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.5900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.6000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.6100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.6300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.6400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.6500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.6900       Open Market/Broker




                                                                                          Page 28 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/20/2007       Buy          389       124.7100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.7200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.7300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.7400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.7600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.7700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.7800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.8200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.8300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.8500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.8600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.8700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.8800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.8900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       124.9000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.9100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.9200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       124.9300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       124.9400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.9500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       124.9600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.9700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       124.9800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       124.9900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.0000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.0100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.0300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.0400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          779       125.0500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       125.0600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.0800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.0900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.1000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.1100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       125.1300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       125.1400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          779       125.1500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.1600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          584       125.1700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.1800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.1900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          779       125.2000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,168       125.2100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       125.2200       Open Market/Broker




                                                                                          Page 29 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/20/2007       Buy          292       125.2300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,266       125.2400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          779       125.2500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.2600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       125.2700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          584       125.2800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.2900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,558       125.3000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           97       125.3100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          195       125.3200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.3300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,168       125.3400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        2,142       125.3500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,266       125.3600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          292       125.3700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          389       125.3800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.3900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          779       125.4000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          681       125.4100       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.4200       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          974       125.4300       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,266       125.4400       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,168       125.4500       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          487       125.4600       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        1,363       125.4700       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          681       125.4800       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy          681       125.4900       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy        7,507       125.5000       Open Market/Broker
SPO Partners II, L.P.                 8/20/2007       Buy           96       127.2000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       123.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.0800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.1000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.2000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.2300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.2800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.2900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.3000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.3500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.3600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.3700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.4200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.4300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.4400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.5000       Open Market/Broker




                                                                                          Page 30 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.5100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.5200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.5400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.5900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.6000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.6100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.6300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.6400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       124.7100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.7200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.7300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.7400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.7600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.7700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.7800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.8200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.8300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.8500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.8600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.8900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       124.9000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.9100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.9200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       124.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       124.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       124.9600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       124.9800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       124.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.0100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.0300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.0400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           21       125.0500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       125.0600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.0800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.0900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.1000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.1100       Open Market/Broker




                                                                                          Page 31 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.1300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.1400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           21       125.1500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.1600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           16       125.1700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.1800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.1900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           21       125.2000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           32       125.2100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.2200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.2300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           34       125.2400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           21       125.2500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.2600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.2700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           16       125.2800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.2900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           42       125.3000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       125.3100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            5       125.3200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.3300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           32       125.3400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           58       125.3500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           34       125.3600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            8       125.3700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           11       125.3800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.3900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           21       125.4000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           19       125.4100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.4200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           26       125.4300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           34       125.4400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           32       125.4500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           13       125.4600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           37       125.4700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           19       125.4800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy           19       125.4900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy          193       125.5000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/20/2007       Buy            3       127.2000       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          879       124.0399       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,366       124.0679       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,074       124.0886       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       124.1350       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,269       124.3038       Open Market/Broker




                                                                                          Page 32 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/21/2007       Buy          781       124.3925       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          878       124.4556       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,562       124.5003       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       124.5033       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       124.5800       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,562       124.6250       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       124.6450       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       124.6600       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       124.7200       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       124.7900       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       124.7925       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       124.8100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          127       124.8500       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       124.9500       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       124.9925       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.0000       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       125.0150       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,240       125.0261       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       125.0400       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,366       125.0607       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.1920       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.2067       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,171       125.2492       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.2833       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.3133       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       125.3300       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          781       125.3613       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          976       125.4100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.4140       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,074       125.4173       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,074       125.4336       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,464       125.4493       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.4517       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.4640       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,659       125.5165       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,074       125.5200       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       125.5400       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        2,245       125.5422       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       125.5486       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.6000       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.6017       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,659       125.6241       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.6280       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       125.6500       Open Market/Broker




                                                                                          Page 33 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/21/2007       Buy           98       125.6900       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.6967       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.7117       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       125.7120       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       125.7125       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       125.7175       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,171       125.7242       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       125.7320       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.7400       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       125.7417       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       125.7900       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.8100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,171       125.8192       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       125.8414       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       125.8471       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,659       125.8953       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       125.9300       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          878       125.9322       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,366       125.9721       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,269       125.9877       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,464       125.9987       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.0420       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.0650       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.0833       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       126.0857       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       126.0943       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.1100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,171       126.1208       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.1240       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.1360       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.1483       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.1700       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       126.1743       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.1767       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,562       126.1788       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.1850       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.1950       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.2000       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       126.2100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       126.2200       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,464       126.2247       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.2340       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.2350       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.2475       Open Market/Broker




                                                                                          Page 34 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 8/21/2007       Buy           98       126.2500       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.2517       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          781       126.2525       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.2567       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,366       126.2779       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       126.2800       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy           98       126.3100       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          878       126.3367       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.3380       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       126.3450       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          488       126.3620       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.3883       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.3900       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.3950       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.4050       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.4133       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.4200       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       126.4500       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          781       126.4513       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.4567       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          390       126.4600       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          586       126.4667       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          195       126.4700       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        2,245       126.4737       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,171       126.4800       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,366       126.4807       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          878       126.4822       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          683       126.4829       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.4833       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          293       126.4833       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy          878       126.4844       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,464       126.4967       Open Market/Broker
SPO Partners II, L.P.                 8/21/2007       Buy        1,562       126.5000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           17       124.0399       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           27       124.0679       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           21       124.0886       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            4       124.1350       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           25       124.3038       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           15       124.3925       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           17       124.4556       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           30       124.5003       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       124.5033       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            8       124.5800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           30       124.6250       Open Market/Broker




                                                                                          Page 35 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       124.6450       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            4       124.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            4       124.7200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            8       124.7900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            8       124.7925       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       124.8100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            3       124.8500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       124.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            8       124.9925       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       125.0150       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           25       125.0261       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       125.0400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           27       125.0607       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.1920       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.2067       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           24       125.2492       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.2833       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.3133       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       125.3300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           15       125.3613       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           20       125.4100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.4140       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           21       125.4173       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           21       125.4336       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           29       125.4493       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.4517       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.4640       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           33       125.5165       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           21       125.5200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       125.5400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           44       125.5422       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       125.5486       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.6000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.6017       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           33       125.6241       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.6280       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       125.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       125.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.6967       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.7117       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.7120       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.7125       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.7175       Open Market/Broker




                                                                                          Page 36 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/21/2007       Buy           24       125.7242       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.7320       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.7400       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       125.7417       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       125.7900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.8100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           24       125.8192       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       125.8414       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       125.8471       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           33       125.8953       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       125.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           18       125.9322       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           27       125.9721       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           26       125.9877       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           29       125.9987       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.0420       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.0650       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.0833       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       126.0857       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       126.0943       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           24       126.1208       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1240       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1360       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.1483       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       126.1743       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.1767       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           30       126.1788       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1850       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.1950       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.2000       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       126.2100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       126.2200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           29       126.2247       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.2340       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.2350       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.2475       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       126.2500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.2517       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           15       126.2525       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.2567       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           27       126.2779       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       126.2800       Open Market/Broker




                                                                                          Page 37 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          8/21/2007       Buy            2       126.3100       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           18       126.3367       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.3380       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       126.3450       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.3620       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.3883       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.3900       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.3950       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.4050       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.4133       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.4200       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       126.4500       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           15       126.4513       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.4567       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            9       126.4600       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           11       126.4667       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            5       126.4700       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           44       126.4737       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           24       126.4800       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           27       126.4807       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           18       126.4822       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           13       126.4829       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.4833       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy            6       126.4833       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           18       126.4844       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           29       126.4967       Open Market/Broker
Phoebe Snow Foundation, Inc.          8/21/2007       Buy           30       126.5000       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       124.0399       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       124.0679       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       124.0886       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       124.1350       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       124.3038       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       124.3925       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       124.4556       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       124.5003       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       124.6250       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       124.6450       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.0261       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.0607       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.1920       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.2492       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.2833       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.3613       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4100       Open Market/Broker




                                                                                          Page 38 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4140       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4173       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4336       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.4493       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4517       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.4640       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.5165       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.5200       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            3       125.5422       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.5486       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.6000       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.6017       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.6241       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.6280       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.7117       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.7120       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.7242       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.7400       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.7417       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.8192       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.8414       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.8471       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.8953       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.9322       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.9721       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       125.9877       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       125.9987       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.0420       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.0857       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.0943       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1208       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1240       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1360       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1483       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1700       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.1743       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.1788       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2000       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.2247       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2340       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2517       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2525       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2567       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.2779       Open Market/Broker




                                                                                          Page 39 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.2800       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.3367       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.3380       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.3620       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.3883       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.3900       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4513       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4567       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4667       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            3       126.4737       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4800       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.4807       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4822       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4829       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            1       126.4844       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.4967       Open Market/Broker
The Elizabeth R. & William J.
Patterson Foundation                  8/21/2007       Buy            2       126.5000       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       124.0399       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       124.0679       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       124.0886       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       124.3038       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       124.3925       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       124.4556       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       124.5003       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.5033       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       124.5800       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       124.6250       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.6450       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.6600       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.7200       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.7900       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.7925       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       124.9925       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.0000       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.0261       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.0607       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.1920       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.2067       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.2492       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.2833       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.3133       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.3613       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.4100       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.4140       Open Market/Broker




                                                                                          Page 40 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

John H. Scully's IRRA                 8/21/2007       Buy            3       125.4173       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.4336       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.4493       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.4517       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.4640       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       125.5165       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.5200       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            5       125.5422       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.5486       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.6000       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.6017       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       125.6241       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.6280       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.6967       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7117       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7120       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7125       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7175       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.7242       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7320       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7400       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7417       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.7900       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.8100       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.8192       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.8414       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.8471       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       125.8953       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       125.9300       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       125.9322       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.9721       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.9877       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       125.9987       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.0420       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.0650       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.0833       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.0857       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.0943       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1100       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.1208       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1240       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1360       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1483       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1700       Open Market/Broker




                                                                                          Page 41 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

John H. Scully's IRRA                 8/21/2007       Buy            2       126.1743       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1767       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       126.1788       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1850       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.1950       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2000       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.2247       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2340       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2350       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2475       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2517       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.2525       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.2567       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.2779       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.2800       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.3367       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.3380       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.3620       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.3883       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.3900       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.3950       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4050       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4133       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4200       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.4513       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4567       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4600       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4667       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            5       126.4737       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.4800       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.4807       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.4822       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.4829       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4833       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            1       126.4833       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            2       126.4844       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            3       126.4967       Open Market/Broker
John H. Scully's IRRA                 8/21/2007       Buy            4       126.5000       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.0399       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       124.0679       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.0886       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.3038       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.3925       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.4556       Open Market/Broker




                                                                                          Page 42 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

William H. Patterson's IRA            8/21/2007       Buy            2       124.5003       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       124.6250       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.6450       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.7900       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.7925       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       124.9925       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.0261       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.0607       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.1920       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.2492       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.2833       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.3613       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4100       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4140       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4173       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4336       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.4493       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4517       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.4640       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.5165       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.5200       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            3       125.5422       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.5486       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.6000       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.6017       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.6241       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.6280       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.7117       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.7120       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.7242       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.7400       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.7417       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.8192       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.8414       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.8471       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.8953       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.9322       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.9721       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       125.9877       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       125.9987       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.0420       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.0857       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.0943       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.1208       Open Market/Broker




                                                                                          Page 43 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

William H. Patterson's IRA            8/21/2007       Buy            1       126.1240       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.1360       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.1483       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.1700       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.1743       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.1788       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2000       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.2247       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2340       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2517       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2525       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2567       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.2779       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.2800       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.3367       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.3380       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.3620       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.3883       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.3900       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4513       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4567       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4667       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            3       126.4737       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4800       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.4807       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4822       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4829       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            1       126.4844       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.4967       Open Market/Broker
William H. Patterson's IRA            8/21/2007       Buy            2       126.5000       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy           98       125.6600       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy           98       125.6700       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy           98       125.8000       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy           98       125.8400       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          293       125.8700       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          781       125.8700       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          488       125.9000       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        5,271       125.9526       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        1,757       126.0017       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        4,978       126.1535       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        5,368       126.1780       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          781       126.2413       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,635       126.4612       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        1,854       126.6763       Open Market/Broker




                                                                                          Page 44 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 9/10/2007       Buy        2,830       126.8324       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,733       126.8400       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        1,659       126.8935       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,050       126.9148       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          976       126.9480       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,733       126.9557       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        4,783       126.9590       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          976       126.9640       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,050       126.9790       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        1,074       126.9791       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,733       126.9882       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          293       126.9900       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        1,757       126.9917       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,538       126.9923       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy          878       126.9944       Open Market/Broker
SPO Partners II, L.P.                 9/10/2007       Buy        2,339       127.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            2       125.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            2       125.6700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            2       125.8000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            2       125.8400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            7       125.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           19       125.8700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           12       125.9000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy          129       125.9526       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           43       126.0017       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy          122       126.1535       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy          132       126.1780       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           19       126.2413       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           65       126.4612       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           46       126.6763       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           70       126.8324       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           67       126.8400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           41       126.8935       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           50       126.9148       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           24       126.9480       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           67       126.9557       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy          117       126.9590       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           24       126.9640       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           50       126.9790       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           26       126.9791       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           67       126.9882       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy            7       126.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           43       126.9917       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           62       126.9923       Open Market/Broker




                                                                                          Page 45 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          9/10/2007       Buy           22       126.9944       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/10/2007       Buy           61       127.0000       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy          293       134.1200       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy          100       134.1700       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy          195       134.2800       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy        1,953       134.2940       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy       38,482       134.3000       Open Market/Broker
SPO Partners II, L.P.                 9/21/2007       Buy          977       134.3030       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy            7       134.1200       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy            2       134.1700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy            5       134.2800       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy           47       134.2940       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy          916       134.3000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/21/2007       Buy           23       134.3030       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        2,051       132.6186       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,270       132.6292       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          293       132.6300       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy           98       132.6400       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          586       132.6500       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          781       132.6600       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          879       132.6700       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          725       132.6900       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          293       132.7000       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          781       132.7100       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          195       132.7200       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          293       132.7300       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,522       132.7400       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          879       132.7500       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          879       132.7933       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          195       132.9400       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          293       132.9700       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          195       132.9800       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          488       132.9900       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,953       133.0000       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        2,344       133.6171       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          488       133.6940       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,563       133.6994       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,074       133.7945       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          391       133.7950       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          391       133.8350       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          488       133.8660       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          391       133.8800       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          488       133.8980       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,367       133.9100       Open Market/Broker




                                                                                          Page 46 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 9/24/2007       Buy           98       133.9300       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          293       133.9400       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy           98       133.9500       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,660       133.9618       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,074       133.9782       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy           98       133.9800       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy          684       133.9871       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy           98       133.9900       Open Market/Broker
SPO Partners II, L.P.                 9/24/2007       Buy        1,463       134.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           49       132.6186       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           30       132.6292       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            7       132.6300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            2       132.6400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           14       132.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           19       132.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           21       132.6700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           17       132.6900       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            7       132.7000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           19       132.7100       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            5       132.7200       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            7       132.7300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           36       132.7400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           21       132.7500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           21       132.7933       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            5       132.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            7       132.9700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            5       132.9800       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           12       132.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           47       133.0000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           56       133.6171       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           12       133.6940       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           37       133.6994       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           26       133.7945       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            9       133.7950       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            9       133.8350       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           12       133.8660       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            9       133.8800       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           12       133.8980       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           33       133.9100       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            2       133.9300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            7       133.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            2       133.9500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           40       133.9618       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           26       133.9782       Open Market/Broker




                                                                                          Page 47 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          9/24/2007       Buy            2       133.9800       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           16       133.9871       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy            2       133.9900       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/24/2007       Buy           37       134.0000       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       129.7178       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        5,172       129.9640       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,855       129.9995       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,244       130.0830       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          293       130.0967       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,464       130.1300       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.1520       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,171       130.1658       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          293       130.1933       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,757       130.2117       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          684       130.2314       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        4,783       130.2562       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,073       130.3432       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          684       130.3536       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          195       130.3700       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       130.3911       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,635       130.4000       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.4200       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,050       130.4438       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          976       130.4500       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          684       130.4600       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          684       130.4871       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.5000       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          976       130.5100       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          146       130.5200       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          244       130.5300       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,171       130.5425       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        4,197       130.5649       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.5842       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          683       130.5929       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,562       130.6125       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.6320       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,171       130.6367       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          683       130.6386       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.6488       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          195       130.6500       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.6925       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,074       130.6982       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.7010       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,854       130.7016       Open Market/Broker




                                                                                          Page 48 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 9/25/2007       Buy        2,342       130.7167       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.7250       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,757       130.7264       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.7275       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.7333       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        4,880       130.7355       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          683       130.7357       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       130.7367       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       130.7422       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy       40,211       130.7500       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,562       130.7569       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,464       130.7613       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,171       130.7656       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,464       130.7807       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.7840       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          781       130.7913       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.8083       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy           98       130.8100       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,562       130.8131       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,074       130.8245       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.8360       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       130.8422       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.8467       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          781       130.8479       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,147       130.8534       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.8690       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,659       130.8818       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          195       130.8900       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,147       130.9152       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,171       130.9175       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,757       130.9336       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.9363       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          195       130.9400       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          586       130.9950       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        6,442       130.9974       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       130.9975       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       130.9980       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          976       131.0290       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        2,538       131.0375       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,464       131.0593       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          488       131.0680       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,464       131.1247       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       131.1300       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,659       131.1403       Open Market/Broker




                                                                                          Page 49 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

SPO Partners II, L.P.                 9/25/2007       Buy        2,538       131.1667       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          390       131.1850       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy          878       131.2144       Open Market/Broker
SPO Partners II, L.P.                 9/25/2007       Buy        1,269       131.6600       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       129.7178       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          124       129.9640       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           44       129.9995       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           54       130.0830       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            7       130.0967       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           35       130.1300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.1520       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           28       130.1658       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            7       130.1933       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           42       130.2117       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.2314       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          114       130.2562       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           26       130.3432       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.3536       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            5       130.3700       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       130.3911       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           63       130.4000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.4200       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           49       130.4438       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           23       130.4500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.4600       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.4871       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           10       130.5000       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           23       130.5100       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            4       130.5200       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            6       130.5300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           28       130.5425       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          100       130.5649       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.5842       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.5929       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           37       130.6125       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.6320       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           28       130.6367       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.6386       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       130.6488       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            5       130.6500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       130.6925       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           26       130.6982       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.7010       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           44       130.7016       Open Market/Broker




                                                                                          Page 50 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          9/25/2007       Buy           56       130.7167       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       130.7250       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           42       130.7264       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       130.7275       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.7333       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          117       130.7355       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           16       130.7357       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       130.7367       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       130.7422       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          961       130.7500       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           37       130.7569       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           35       130.7613       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           28       130.7656       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           35       130.7807       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.7840       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           19       130.7913       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.8083       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            2       130.8100       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           37       130.8131       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           26       130.8245       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.8360       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       130.8422       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.8467       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           19       130.8479       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           51       130.8534       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.8690       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           40       130.8818       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            5       130.8900       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           51       130.9152       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           28       130.9175       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           42       130.9336       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.9363       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            5       130.9400       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           14       130.9950       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy          154       130.9974       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       130.9975       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       130.9980       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           23       131.0290       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           61       131.0375       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           35       131.0593       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           12       131.0680       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           35       131.1247       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       131.1300       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           40       131.1403       Open Market/Broker




                                                                                          Page 51 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

Phoebe Snow Foundation, Inc.          9/25/2007       Buy           61       131.1667       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy            9       131.1850       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           21       131.2144       Open Market/Broker
Phoebe Snow Foundation, Inc.          9/25/2007       Buy           30       131.6600       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       129.7178       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            4       129.9640       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       129.9995       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.0830       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.1300       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.1658       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.2117       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            3       130.2562       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.3432       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.3911       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.4000       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.4438       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.4500       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.5100       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.5425       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            3       130.5649       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.5929       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.6125       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.6367       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.6386       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.6488       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.6925       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.7016       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.7167       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7250       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7264       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7275       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            3       130.7355       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7357       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7367       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7422       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy           28       130.7500       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7569       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7613       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7656       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.7807       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.8131       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.8422       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.8534       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.8818       Open Market/Broker




                                                                                          Page 52 of 53 pages
                                                   SCHEDULE I TO
                                      SCHEDULE 13D FOR SPO PARTNERS II, L.P.

                                        DATE OF                NUMBER OF     PRICE PER            WHERE/HOW
        REPORTING PERSON              TRANSACTION    TYPE       SHARES        SHARE ($)      TRANSACTION EFFECTED
----------------------------------    -----------    ----      ---------     ---------      --------------------
                                                                             

The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            2       130.9152       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.9175       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.9336       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            4       130.9974       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       130.9975       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.0290       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.0375       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.0593       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.1247       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.1300       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.1403       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.1667       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.1850       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.2144       Open Market/Broker
The Elizabeth R. & William J.
  Patterson Foundation                9/25/2007       Buy            1       131.6600       Open Market/Broker



                                                             Page 53 of 53 pages


                                  EXHIBIT INDEX

EXHIBIT    DOCUMENT DESCRIPTION
-------    --------------------
A          Agreement Pursuant to Rule 13d-1 (k)