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Figure 3-1. A. Wolfcampian structure and outline of present field and of accumulation during Late Tertiary when substantial gas migrated from Panhandle field. There the gas cap expanded beyond the spillpoint into Hugoton. B. Upper Wolfcampian facies, with redistribution of hydrocarbons in Panhandle field and mass migration into Hugoton. C. Pressure plot for reservoir during Late Tertiary in comparison to Early Tertiary.