Depth within the Martian subsurface at which pF₁₀ occurs for the methanogen species M. soligelidi (left) and M. barkeri (right) for one sol of exposure. Absorption coefficients (mm⁻¹) of JSC-1 were obtained from P. J. Godin et al. (2023) for 150 μm (top) and 850 μm (bottom) grain sizes to determine subsurface pF₁₀ depths. The x- and y-axes display Martian latitude and solar longitude respectively. The colour bars represent increasing depth within the subsurface as colours change from blue to yellow. Note the differing colour scales of the 150 μm (top) and 850 μm (bottom) plots.