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Identification Nos. of above persons  (entities only).   $ San Francisco Partners, L.P.~  0(Check the Appropriate Box if a Member of"a Group (See Instructions)(a) [_](b) [X]~  SEC Use Only~ ,$Citizenship or Place of Organization California$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/@(Du@q/iQ=PF0*8X> @ l  k dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } m} $}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE Number of~ Sole Voting Power Shares    Beneficially   327,350 (1) Owned by Each    Reporting~  Shared Voting Power Person With:~ ~ Sole Dispositive Power 327,350 (1)~ " Shared Dispositive Power~ $____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8u5 ]-x:=PF0*8X> @ l  u dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} 7     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ &.&Aggregate Amount Beneficially Owned by  Each Reporting Person   ~ ~ *0 (Check if the Aggregate Amount in Row (9)6.Excludes Certain Shares (See Instructions) [_]~ ..&Percent of Class Represented by Amount in Row (9) 0.3%~ 23+Type of Reporting Person (See Instructions) (PN)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:u5N6[C'=PF0*8X> @ l  * dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} $4     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ #Names of Reporting Persons. 3 +I.R.S. 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SPO Advisory Corp.~  0(Check the Appropriate Box if a Member of"a Group (See Instructions)(a) [_](b) [X]~  SEC Use Only~ ,$Citizenship or Place of OrganizationDelaware$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/@Du@{9s[=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } m} $}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE Number of~ Sole Voting Power Shares    Beneficially  11,508,604 (1)(2) Owned by Each  Reporting~  Shared Voting Power Person With:~ ~ Sole Dispositive Power11,508,604 (1)(2)~ " Shared Dispositive Power~ $____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8u5 o?F"=PF0*8X> @ l  ߲ dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} 7     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ &.&Aggregate Amount Beneficially Owned by  Each Reporting Person   ~ m~ *0 (Check if the Aggregate Amount in Row (9)6.Excludes Certain Shares (See Instructions) [_]~ ..&Percent of Class Represented by Amount in Row (9) 9.9%~ 23+Type of Reporting Person (See Instructions) (CO)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:u5N6[C'=PF0*8X> @ l  O dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} $4     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ #Names of Reporting Persons. 3 +I.R.S. Identification Nos. of above persons  (entities only).    John H. Scully~  0(Check the Appropriate Box if a Member of"a Group (See Instructions)(a) [_](b) [X]~  SEC Use Only~ ,$Citizenship or Place of Organization USA$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/@Du@= w_!=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } m} $}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE Number of~ Sole Voting Power Shares    Beneficially   6,600 (1) Owned by Each  Reporting~  Shared Voting Power Person With:11,508,604 (2)~ Sole Dispositive Power 6,600 (1)~ " Shared Dispositive Power11,508,604 (2)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8u5 wGJ&=PF0*8X> @ l  x dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} 7     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ &.&Aggregate Amount Beneficially Owned by  Each Reporting Person   ~ վ~ *0 (Check if the Aggregate Amount in Row (9)6.Excludes Certain Shares (See Instructions) [_]~ ..&Percent of Class Represented by Amount in Row (9) 9.9%~ 23+Type of Reporting Person (See Instructions) (IN)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:u5N6[C'=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} $4     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ #Names of Reporting Persons. 3 +I.R.S. Identification Nos. of above persons  (entities only).    William E. Obendorf~  0(Check the Appropriate Box if a Member of"a Group (See Instructions)(a) [_](b) [X]~  SEC Use Only~ ,$Citizenship or Place of Organization USA$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/@Du@z8rZ=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } m} $}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE Number of~ Sole Voting Power Shares    Beneficially   38,600 (1) Owned by Each  Reporting~  Shared Voting Power Person With:11,508,604 (2)~ Sole Dispositive Power 38,600 (1)~ " Shared Dispositive Power11,508,604 (2)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8u5 vFH$=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} 7     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ &.&Aggregate Amount Beneficially Owned by  Each Reporting Person   ~ ~ *0 (Check if the Aggregate Amount in Row (9)6.Excludes Certain Shares (See Instructions) [_]~ ..&Percent of Class Represented by Amount in Row (9) 9.9%~ 23+Type of Reporting Person (See Instructions) (IN)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:u5N6[C'=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} $4     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ #Names of Reporting Persons. 3 +I.R.S. Identification Nos. of above persons  (entities only).    Edward H. McDermott~  0(Check the Appropriate Box if a Member of"a Group (See Instructions)(a) [_](b) [X]~  SEC Use Only~ ,$Citizenship or Place of Organization USA$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/@Du@z8rZ=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } m} $}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE Number of~ Sole Voting Power Shares    Beneficially   1,100 (1) Owned by Each  Reporting~  Shared Voting Power Person With:11,508,604 (2)~ Sole Dispositive Power 1,100 (1)~ " Shared Dispositive Power11,508,604 (2)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8u5 wGJ&=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $} 7     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE~ &.&Aggregate Amount Beneficially Owned by  Each Reporting Person   ~ "~ *0 (Check if the Aggregate Amount in Row (9)6.Excludes Certain Shares (See Instructions) [_]~ ..&Percent of Class Represented by Amount in Row (9) 9.9%~ 23+Type of Reporting Person (See Instructions) (IN)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:u5N6[C'=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } } a/     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE (a)Name of Issuer     ) !Pioneer Natural Resources Company     (b)/ 'Address of Issuer?s Principal ExecutiveOffices)!5205 N. O?Connor Blvd., Suite 200Irving, Texas 75039$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/0u@e:Z=PF0*8X> @ l  $$% dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } } 6 $    SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE0(The principal business address of JHS is  5 -591 Redwood Highway, Suite 3215, Mill Valley,  1 )California 94941. JHS is a citizen of the  ! United States of America.   0(The principal business address of WEO is5-591 Redwood Highway, Suite 3215, Mill Valley,1)California 94941. WEO is a citizen of the!United States of America.0(The principal business address of EHM is5-591 Redwood Highway, Suite 3215, Mill Valley,1)California 94941. EHM is a citizen of the!United States of America. (d)$Title of Class of Securities0(Common Stock, par value $0.01 per share. (e)CUSIP Number:ADulu)N*@Bp- eA !"# $!____________________________1")Created by Morningstar Document Research.0#(http://documentresearch.morningstar.com/ <=PF0*8X> @##""!! l  / dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P. 11,181,254 common shares # SPO Advisory Partners, L.P. 11,181,254 common shares $ San Francisco Partners, L.P. 327,350 common shares " SF Advisory Partners, L.P. 327,350 common shares  SPO Advisory Corp. 11,508,604 common sharesJohn H. Scully 11,515,204 common sharesWilliam E. Oberndorf 11,547,204 common sharesEdward H. McDermott 11,509,704 common shares$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/.ku$x%==PF0*8X> @ l  O9 dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P. 9.6% # SPO Advisory Partners, L.P. 9.6% $ San Francisco Partners, L.P. 0.3% " SF Advisory Partners, L.P. 0.3%  SPO Advisory Corp. 0.3%John H. Scully 9.9%William E. Oberndorf 9.9%Edward H. McDermott 9.9%** Denotes less than$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/2Iu8o5d, =PF0*8X> @ l  C dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P. 11,181,254 common shares   # SPO Advisory Partners, L.P. 11,181,254 common shares   $ San Francisco Partners, L.P. 327,350 common shares   " SF Advisory Partners, L.P. 327,350 common shares    SPO Advisory Corp. 11,508,604 common sharesJohn H. Scully6,600 common sharesWilliam E. Oberndorf38,600 common sharesEdward H. McDermott1,100 common shares$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/.u 0_<0$=PF0*8X> @ l  N dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P.0 common shares   # SPO Advisory Partners, L.P. 0 common shares   $ San Francisco Partners, L.P. 0 common shares   " SF Advisory Partners, L.P. 0 common shares    SPO Advisory Corp. 0 common sharesJohn H. Scully 11,508,604 common sharesWilliam E. Oberndorf 11,508,604 common sharesEdward H. McDermott 11,508,604 common shares$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/.uH$UI==PF0*8X> @ l  X dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (33)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P. 11,181,254 common shares   # SPO Advisory Partners, L.P. 11,181,254 common shares   $ San Francisco Partners, L.P. 327,350 common shares   " SF Advisory Partners, L.P. 327,350 common shares    SPO Advisory Corp. 11,508,604 common sharesJohn H. Scully6,600 common sharesWilliam E. Oberndorf38,600 common shares$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/,|u 0_^=PF0*8X> @ l  qb dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (34)NO TITLE (35)NO TITLE (36)U } $ } I"}      SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLESPO Partners II, L.P.0 common shares   # SPO Advisory Partners, L.P. 0 common shares   $ San Francisco Partners, L.P. 0 common shares   " SF Advisory Partners, L.P. 0 common shares    SPO Advisory Corp. 0 common sharesJohn H. Scully 11,508,604 common sharesWilliam E. Oberndorf 11,508,604 common sharesEdward H. McDermott 11,508,604 common shares$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/.uH$UI==PF0*8X> @ l  &{mn dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (35)NO TITLE (36)U } $ } $4 &    SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE  Date       Signature Kim M. SilvaAttorney-in-fact for:!SPO Partners II, L.P. (1)'SPO Advisory Partners, L.P. (1)( San Francisco Partners, L.P. (1)&SF Advisory Partners, L.P. (1)SPO Advisory Corp. (1)John H. Scully (1) William E. Oberndorf (1)Edward H. McDermott (1)/'(1) A Power of Attorney authorizing Kim3+M. Silva to act on behalf of this person or%entity is filed as Exhibit B.Dlu]A)l?'Q#C !"#$%  !"$#____________________________1$)Created by Morningstar Document Research.0%(http://documentresearch.morningstar.com/9d=PF0*8X> @%%$$## l  v dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (36)U } I } +     SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLEExhibitDocument Description   A+ #Agreement Pursuant to Rule 13d-1(k)   B, $Power of Attorney (Previously filed)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/(xTuB*Y=PF0*8X> @ l  )KÃ dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/??$ NO TITLE NO TITLE (1) NO TITLE (2) NO TITLE (3) NO TITLE (4) NO TITLE (5) NO TITLE (6) NO TITLE (7) NO TITLE (8) NO TITLE (9)NO TITLE (10)NO TITLE (11)NO TITLE (12)NO TITLE (13)NO TITLE (14)NO TITLE (15)NO TITLE (16)NO TITLE (17)NO TITLE (18)NO TITLE (19)NO TITLE (20)NO TITLE (21)NO TITLE (22)NO TITLE (23)NO TITLE (24)NO TITLE (25)NO TITLE (26)NO TITLE (27)NO TITLE (28)NO TITLE (29)NO TITLE (30)NO TITLE (31)NO TITLE (32)NO TITLE (33)NO TITLE (34)NO TITLE (35)U } $ } $4 )    SPO ADVISORY CORPSC 13G/A 02/14/2011NO TITLE  Date      Signature Kim M. SilvaAttorney-in-fact for:!SPO Partners II, L.P. (1)'SPO Advisory Partners, L.P. (1)( San Francisco Partners, L.P. (1)&SF Advisory Partners, L.P. (1)SPO Advisory Corp. (1)John H. Scully (1) William E. Oberndorf (1)Edward H. McDermott (1)/'(1) A Power of Attorney authorizing KimDUlu]A5lT'o9  !"#$%&'( 3 +M. Silva to act on behalf of this person or!1!)entity has been previously filed with the"'"Securities Exchange Commission.##$%$&____________________________1')Created by Morningstar Document Research.0((http://documentresearch.morningstar.com/0|E-!=PF0*8X> @((''&& Root Entry FBook  6  !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~