Histograms of the water content of the planets in the synthetic NGPPS population for solar mass stars, generated using the Bern Model of planet formation and evolution. The top panel shows the water mass fraction with respect to the mass of the volatile envelope layer of each planet, the bottom panel the water mass fraction with respect to the total planetary mass. Each panel contains two histograms, one showing all the planets in the population with masses between 0.5 and 30 M_⊕ and within 2 AU (purple) and one showing the synthetic planets that fall into the Hot Water World triangles with an equilibrium temperature of at least 600 K (light blue). For the top panel, the former was split into two separate subgroups; planets with an envelope mass fraction of at least 0.01% and planets with lower envelope mass fractions, for which defining an envelope water mass fraction is difficult (shaded in black).