Corner plot showing the results on the interior composition models of HD 3167b (left) and HD 3167c, (right). The vertical dashed lines and the ‘error bars’ given at the top of each column represent the 5 and 95% percentiles. The internal structure parameters are the mass fraction of the core and the water layer with respect to the solid planet, the molar fraction of Si and Mg in the mantle, the molar fraction of Fe in the inner core and the logarithm of the gas mass in Earth masses.