Corner plot showing the results of the internal structure retrieval for HD 5278 b in the case of a fully differentiated planet model. The different columns refer to the core (iron + sulfur) mass fraction, the silicate mantle mass fraction, the water mass fraction, the molar fraction of Fe, Si, and Mg in the mantle, the molar fraction of Fe in the core, the log of the gas mass (in Earth masses), the log of the atmospheric thickness (Earth radii), and the total radius and mass, respectively. In the two last columns, the blue lines show the observed values. For each column, the mean of the distribution as well as the 5% and 95% quantile are indicated onthe top, and the 5% and 95% quantiles are also indicated with dashed vertical lines.