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Figure F1. Downcore profiles of methane and ethane concentration, C₁/C₂₊ ratios, and isotopic compositions (δ¹³C_CH4 and δD_CH4) in headspace gas at (A) Site U1380, (B) Site U1412, and (C) Site U1413. Red dashed lines represent lithostratigraphic unit boundaries. Methane and ethane concentration and C₁/C₂₊ ratios are onboard data.

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