Figure F16. C₁/C₂ values measured at all sites from vacutainer samples. The same patterns are shown in headspace samples, although absolute values of C₁/C₂ are somewhat smaller. Samples are spaced at ~5-m intervals (two per core). A. Sites on the western flank of Hydrate Ridge. B. Sites on the eastern flank of Hydrate Ridge. C. Sites near the summit of Hydrate Ridge. BSR and Horizon A depth at each site is shown as a color-coded dashed line.