Figure F21. Headspace and vacutainer methane (C1) concentrations and C1/C2 ratio in sediments from Hole 1234A vs. depth. Open circles = headspace, solid circles = vacutainer. Because of the direct sampling method, vacutainer gas concentrations are higher than headspace gas concentrations.

Figure F21. Headspace and vacutainer methane (C₁) concentrations and C₁/C₂ ratio in sediments from Hole 1234A vs. depth. Open circles = headspace, solid circles = vacutainer. Because of the direct sampling method, vacutainer gas concentrations are higher than headspace gas concentrations.