Homogenization temperatures. Homogenization temperatures (Th) of the two-phase aqueous inclusions in veins from localities (a) W1, (b) W4, (c) W5, (d) E1, and (e) E3. In each histogram, the mean value with a standard deviation of 1σ is shown. (f) Homogenization temperatures (Tc) of the one-phase carbonic inclusions (CH4) for samples W4 and E1. The veins in sample W4 contained both CH4-only inclusions and CH4-CO2 mixtures. We identified the CH4-only region in the vein and measured Th (d) and Tc (f).