Source: Quarterly financial reports with the Securities and Exchange Commission, or if necessary, statements signed by company officials and provided to NGI.

Companies providing data directly to NGI include ConocoPhillips, Constellation Energy Commodities Group, Coral Energy Holding (Shell Trading), Louis Dreyfus Highbridge Energy, Merrill Lynch Commodities, Tenaska Marketing Ventures and UBS Energy. Fortis, which bought the Duke/Cinergy marketing arm, did not have figures available for the quarter. Cinergy reported 5.00 Bcf/d in gas sales in 1Q2006. BP plc, which resumed reporting to this survey for 4Q2007, is believed to be the largest North American Gas Marketer by a wide margin.

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