Initial Reports, Volume 201 Shipboard Scientific Party Chapter 7, Table T6. Hydrogen concentrations for incubated headspace samples, Holes 1226B and 1226E. Core, section, interval (cm) Depth (mbsf) Hydrogen (nM) Incubation temperature (degrees C) 201-1226B- 2H-3, 85-91 8.25 0.67 4 4H-3, 55-64 26.95 0.13 4 6H-3, 72-78 46.12 0.22 4 8H-3, 50-56 64.90 0.45 4 10H-3, 57-63 83.97 0.41 4 12H-3, 80-86 103.20 0.38 4 15H-3, 50-56 131.40 0.52 13 18H-3, 75-81 160.15 0.44 13 22H-4, 75-81 198.45 0.35 13 24H-3, 60-66 217.00 0.62 13 27H-3, 81-87 247.21 0.32 13 45X-3, 75-81 400.95 0.72 21 46X-3, 80-86 410.60 0.74 21 201-1226E- 15H-3, 55-61 272.20 0.41 13 16H-3, 55-61 282.05 0.27 13 18H-3, 65-70 301.15 0.31 13 20H-3, 60-66 320.10 0.28 21