Effective Date:                          Friday, September 2, 2005 (close of business)

Contracts:                    

  Henry Hub Index Swap (IN), Chicago City Gate Index Swap (IS), El Paso/Permian Index Swap (IL), Houston Ship Channel Index Swap (IP), Panhandle Index Swap (IV), Waha Index Swap (IY), Dominion Index Swap (IH), PG&E City Gate Index Swap (IK),  Northwest Rockies Index Swap (IR), SoCal Index Swap (IF), San Juan Index Swap (IJ), Sumas Index Swap (IU), TETCO M-3 Index Swap (IX), Transco Zone 6 Index Swap (IT)

Contract Months:      All Months

Note: The revised margin tiers are in bold.