Temperature dependence of the mass–radius relationship for adiabatic models of wet super-Earth planets containing 50% water as solid lines. The surface temperatures and pressures are indicated in the figure. The dots represent detected planets in this range of planetary mass. The isothermal models for pure-water planets (dashed) and wet super-Earth planets (purple) with the corresponding surface temperatures are also displayed in the figure. These correspond to the data shown in Figs. 11 and 12, respectively.