--> Figure 3

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Figure 3. Annual gas production from several U.S. shale plays. Barnett data for 2002 is calculated by doubling production for the first half of the year (which is 97 BCF, for a conservative year-end estimate of 194 BCF). (After Hill and Nelson, 2000.) Barnett production data for the first six months of 2002 is from the Texas Railroad Commission.