Radius histogram of the synthetic planets with P ≤ 100 days, after computing the cooling during 5 Gyr with mass-loss driven by evaporation (solid lines). The dashed grey lines show the overall distribution when evaporation is neglected. Top panels: all the populations. Lower panels: zoom in on radius between that of Earth and Neptune. Left panels: model A (evaporation of H-He envelopes). Right panels: model B (evaporation of H-He-H₂O envelopes). Red, blue, and green indicate different initial water core fractions as in Fig. 3, and black lines the overall distributions. The blue dotted line in the upper panels shows water-rich planets born in discs of α = 10⁻³ (the remaining cases correspond to α = 10⁻⁴).