Correlation plot of the parameters of the planet model made with the code corner (Foreman-Mackey 2016). The marginalised posterior distribution of each parameter is represented in the diagonal and the 2D histogram contours are shown below. The red vertical lines highlight the normal prior (if any), with the dashed line being the mean value and the dotted line being the ± 1σ interval. The values of the axes are not displayed as this plot aims only at revealing parameter correlations (values are reported in Table 3). The strong linear correlation between the geometric albedo A_g and the dayside thermal flux F_day is a result of the degeneracy between reflected light and thermal emission. The plot also shows that the hotspot offset ϕ_them is well defined for high F_day values, as explained in Sect. 5.1.