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Figure F5. A. Methane, ethane, and propane concentrations in the headspace samples from the sediments at and below the mound base of Challenger Mound (Site U1317) as well as the gas wetness data calculated from these concentrations. B. Carbon isotope data of methane plotted against gas wetness data (Site U1317). Note that the depth scales of Hole U1317A and U1317D appear mismatched. The two holes were aligned at the depth of the carbonate mound base. PDB = Peedee belemnite.

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