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Table T20. Geochemistry of headspace gas samples, Hole U1403A.

Core, section,
interval (cm)
Depth
(mbsf)
Methane
(ppmv)
342-U1403A-
1H-4, 0–5 4.50 2.93
2H-7, 0–5 14.80 2.12
3H-7, 0–5 24.30 2.07
4H-7, 0–5 33.50 2.01
5H-7, 0–5 43.10 2.66
6H-7, 0–5 52.88 3.89
7H-7, 0–5 62.30 3.72
8H-7, 0–5 71.83 4.72
9H-7, 0–5 81.00 6.70
10H-7, 0–5 90.71 6.73
11H-7, 0–5 100.30 6.57
12H-5, 0–5 106.81 6.69
13H-5, 142–147 117.63 7.21
14H-7, 0–5 128.64 10.99
15H-6, 0–5 136.80 9.99
16H-6, 0–5 146.05 9.41
19X-7, 0–5 164.80 12.73
20X-7, 0–5 174.60 10.15
21X-7, 0–5 183.90 8.03
22X-3, 0–5 187.60 6.85
23X-7, 0–5 203.50 7.80
25X-5, 0–5 215.70 16.19
26X-7, 0–5 223.26 12.64
27X-6, 0–5 231.70 9.90
28X-6, 0–5 241.40 7.95

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