Table 1.

Gas composition at Tor Caldara shallow-water hydrothermal vent.

Gas composition in mol %
Sample	H2S	H2	CO	CH4	CO2
1	13.8	0.001	0.005	0.21	86.0
2	33.4	0.001	0.011	0.17	66.4
3	37.2	0	0.006	0.16	62.6
4	30.3	0	0.006	0.19	69.5
5	15.7	0	0.023	0.22	84.1
6	27.4	0.001	0.006	0.19	72.4
7	15.4	0.001	0	0.18	84.5
8	17.5	0.002	0.024	0.17	82.3
9	18	0.002	0	0.20	81.8
10	22.7	0	0	0.15	77.2
Average	23.1	0.001	0.008	0.18	76.7
SD	7.9	0.0006	0.008	0.02	7.9

SD, standard deviation.