Posterior distributions for internal structure parameters of HD 224018 c: mass fractions, with respect to the total planet mass, of (i) the inner core (w_core); (ii) the mantle (w_mantle); (iii) the envelope layers (w_envelope); mass fraction of H/He in the envelope (1-Z_envelope); mass fraction of water in the envelope layer (Z_envclopc). Dotted lines show the priors, and dashed vertical lines the median values of the posteriors. Different colours are used for different compositional priors for the planetary Si/Mg/Fe ratios, which were chosen to be stellar (purple), iron-enriched compared to the host star (pink), or freely sampled using a uniform prior (blue). The top row shows models generated using a water prior in agreement with a formation outside the ice line, the bottom row ones with a formation inside the ice line.