Extra case with parameters similar to reference-A (Nikolaou et al. 2019). Comparison of a correct and previous formulation case, in which the only difference is that the previous case excludes the ratio of molar masses from the volatile mass–partial pressure relationship (Eq. (2)). For CO₂ and H₂O: (a) partial pressure, (b) volume mixing ratio, (c) relative difference of previous case to correct case (%).