Figure 6. Diagram comparing ¹⁸O of gas hydrate water of Site 994 (filled squares) and Site 997 (filled circles), ¹⁸O of the interstitial waters and baselines at Sites 994 (open squares and broken line) and Site 997 (open circles and solid line). Difference in ¹⁸O values (¹⁸O_GH-IW) is 3.1 at Site 994 and 3.3-3.8 at Site 997.