The composition of the fluids (gas and brine) is included in Table . Note that the composition of major ions, e.g., Na + and Cl -was not stated explicitly but given in a lumped way. Thus, the composition of Na + and Cl -was recalculated from the Ca +2 , Mg +2 , and HCO 3 -and considering the overall solution electroneutrality. Monovalent cations other than Na + were ignored. Sulfur-containing components were also mentioned in the original paper. Yet, since the distribution of these components is not clearly stated, the brine composition was characterized only in terms of the major ions in Table . Considering the fluid composition in Table , the bubble point pressures that we calculated with PHREEQC and Reaktoro are compared with the degassing pressures calculated by Köhl et al. . It is important to note that both in ref. and this paper, the bubble point pressure corresponds to the pressure that leads to a gas volume in the order of 1×10 -5 L/L of solution. Generally, our calculations are in fair agreement with those from Köhl et al. . Differences in the defined brine composition could justify some of the greater discrepancies observed for the "S2-G2" and "S3-G3" systems.