Distance between the radius distribution of volatile-poor and volatile-rich planets as a function of their mass (horizontal axis) and volatile fraction (color: blue shows a 70% volatile fraction, cyan 50%, green 30%, and red 10%). The two solid lines give the 1σ distribution of the distance obtained after running the same calculation 500 times. The dotted line shows the distance between the radius distribution at 5 Gyr (a measure of the intrinsic variability of the radius distribution – also responsible for the noise evident in all curves), while the solid lines show the distance at 100 Myr. For this figure, we have considered 500 planets in each case.