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(a) Satellite image of an SCD in Namibia and (b) the associated heat map of H2 concentration in soil gas after extrapolating from punctual BIOGAS GA5000 measurements. (c) Long-term monitoring of an SCD in Brazil (Prinzhofer et al., 2019) and (d) Intensity of H2 plotted against time that shows H2 periodic pulses. See Appendix B for coordinates.
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