Left: Specific heat capacity versus temperature for constant c_P (blue) and c_P(T) (dark orange). Right: H₂O pressure-temperature profiles for p_surf = 260 bar and T_surf = 1000 K (dash-dotted) and 2000 K (solid). Profiles assuming constant c_P are shown in blue and profiles assuming temperature dependent c_P are shown in dark orange. Note that for a 1000 K surface, the difference between the profiles is negligible.