Histograms of planets’ radii after 2 Gyr of evolution, for different stellar masses, and for planets with final orbital period below 100 days. Red bars indicate $f_{{\text{H}}_2\text{O},\text{core}}^{\prime }<5\%$, green bars $5\%\le f_{{\text{H}}_2\text{O},\text{core}}^{\prime }<45\%$, and blue bars $f_{{\text{H}}_2\text{O},\text{core}}^{\prime }\ge 45\%$, where $f_{{\text{H}}_2\text{O},\text{core}}^{\prime }$ is the core water mass fraction at 2 Gyr of evolution. The black lines show the overall planet size distribution. Left panels display results for the nominal set-up, and right panels for the collisional set-up (see Sect.A.3).