Notice to Members

Notice No. 239
05/05/2006

New Outright (Scan) Margin Rates and Intra-Commodity Spread Margin Rates and Tier Structures for the Natural Gas Basis, Index Swap, and Swing Swap Contracts

EFFECTIVE DATE: Monday, May 8, 2006 (close of business)

FUTURES CONTRACTS:

Basis Swap Contracts:
CenterPoint Natural Gas Basis Swap Contract (PW), Dawn Natural Gas Basis Swap Contract (DW)

Index Swap Contracts:
CenterPoint Natural Gas Index Swap Contract (II), Dawn Natural Gas Index Swap Contract (IO), ANR, Oklahoma Natural Gas Index Swap Contract (IQ), NGPL, Midcon Natural Gas Index Swap Contract (IW), NGPL, Texok Natural Gas Index Swap Contract (OI), Dermarc Natural Gas Index Swap Contract (DI), Ventura Natural Gas Index Swap Contract (VI)

Swing Swap Contracts:
CenterPoint Natural Gas Swing Swap Contract (VX), Dawn Natural Gas Swing Swap Contract (OW), ANR, Oklahoma Natural Gas Swing Swap Contract (SQ), NGPL, Midcon Natural Gas Swing Swap Contract (PX), NGPL, Texok Natural Gas Swing Swap Contract (OX), Dermarc Natural Gas Swing Swap Contract (DT), Ventura Natural Gas Swing Swap Contract (VS)

CONTRACT MONTHS: All Months

NYMEX Division Outright (Scan) Spread Tiers for PW and DW

Tiers	*New*
1	1st Nearby
2	Greater than 1st Nearby

NYMEX Division Outright (Scan) Spread Tiers for II, IO, IQ, IW, OI, DI, and VI

Tiers	*New*
1	1st - 2nd Nearby
2	Greater than 2nd Nearby

NYMEX Division Outright (Scan) Spread Tiers for VX, OW, SQ, PX, OX, DT and VS

Tiers	*New*
1	All Months

Intra-Commodity Spread Tiers for II, IO, IQ, IW, OI, DI, and VI

Tiers	*New*
1	1st - 2nd Nearby
2	Greater than 2nd Nearby

NYMEX Division Outright (Scan) Margins for New Natural Gas Basis Swap Contracts for (PW and DW)

Tiers	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
Tier 1 - 1st Nearby	$800	$880	$1,080
Tier 2 - Great than 1st Nearby	$300	$330	$405

NYMEX Division Outright (Scan) Margins for New Natural Gas Index Swap Contracts (II, IO, IQ, IW, OI, DI, and VI)

Tiers	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
Tier 1 - 1st to 2nd Nearby	$1,500	$1,650	$2,025
Tier 2 - Great than 2nd Nearby	$100	$110	$135

NYMEX Division Outright (Scan) Margins for New Natural Gas Swing Swap Contracts (VX, OW, SQ, PX, OX, DT and VS)

Contracts	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
All	$3,500	$3,850	$4,725

NYMEX Division Intra-Commodity Spread Margins for New Natural Gas Basis Swap Contracts for (PW and DW)

Contracts	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
All	$25	$28	$34

NYMEX Division Intra-Commodity Spread Margins for New Natural Gas Index Swap Contracts (II, IO, IQ, IW, OI, DI, and VI)

Tiers	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
Tier 1 - 1st to 2nd Nearby	$25	$28	$34
Tier 2 - Great than 2nd Nearby	$25	$28	$34

NYMEX Division Intra-Commodity Spread Margins for New Natural Gas Swing Swap Contracts (VX, OW, SQ, PX, OX, DT and VS)

Contracts	Clearing Member / Maintenance Margin	Member Customer Initial Margin	Non-Member Customer Initial Margin
	*New*	*New*	*New*
All	$100	$110	$135

Should you have any questions or require any further information, please contact exchangeinfo@nymex.com