Mass–radius relationship, normalized to the Earth, obtained for rocky and ice-rich planets with various iron contents (−50% ≤ δ_Fe ≤ + 50%) and ice fractions (0 ≤ x_ice ≤ 50%), relative to the composition of Earth. Each point corresponds to the results obtained using the modeling approach described above, based on Sotin et al. (2007). The lines correspond to the scaling laws using the polynomial coefficients provided in Table 1.