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Pulse emission of H2 from the source at 30-m depth. A. Snapshots of an H2 gas pulse propagation in time. B. [H2%] distribution along a vertical line passing through the source point (see white line on the t = 0 snapshot of Fig. 4A). Note that the [H2] measured at a given depth will strongly vary over the pulse propagation cycle. C. [H2] distribution at 80-cm depth as a function of time. Reference case: no active bacteria, K = 10 Da, surplus in gas pressure at source is 2 bar, Depth of source = 30 m.
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