Top panel: 1σ-confidence regions derived from the 2D posterior distributions for the first scenario, where only the masses and radii are available as data. Bottom panel: 1σ-confidence regions derived from the 2D posterior distributions for the second scenario, where the Fe/Si abundance ratio from Unterborn et al. (2018) is considered together with the mass and radius for each planet. The axis of the ternary diagram indicates the CMF, the WMF, and the mantle mass fraction MMF = 1 – CMF – WMF.