Compared to other publications that have calculated theoretical degassing pressures with PHREEQC, the models implemented in this work yielded similar but not equal values (Figures and). We postulate that these differences are either because of slight differences in the implementation or defined fluid and gas composition. Yet, note that in one of these publications , i.e., , the modelled values were not tested against any experimental measurements. Besides PHREEQC and Reaktoro, different alternatives for modelling the solubility of gases in water and aqueous solutions have been proposed and discussed in the literature, e.g., , , , , . These papers often introduce an in-house implementation of a specific thermodynamic model, whose performance is usually shown for a specific gas. Yet compared to PHREEQC and Reaktoro, these in-house developed codes are often not accessible by the wider community.