Relative Shannon entropy measure H_posterior/H_prior of model parameters plotted for the range of synthetic rocky planets that fit a given M and R (case A, left panels), and M, R, and Fe/Si_◯ (case B, right panels). Model parameters are well constrained for H_posterior/H_prior → 0 (blue colors) and not constrained for H_posterior/H_prior → 1 (red colors). For case B, variations of H_posterior/H_prior along the grid appear not to be smooth which is due to the poor grid resolution. See also Fig. 10.