Posterior probability distribution of the parameters describing the distribution of halo mass for the model including a dependence of M_h on the Sérsic index introduced in Sect. 4.2. In particular, μ_h, 0 is the average log M_h at a stellar mass log M_* = 11.4, average n for that mass and average size given M_* and n. σ_h is the dispersion in log M_h around the average, β_h is a power-law scaling of halo mass with stellar mass, ν_h is a power-law scaling of halo mass with excess Sérsic index (defined as the ratio between the Sérsic index of a galaxy and the average n of galaxies of the same stellar mass), and ξ_h is a power-law scaling of halo mass with excess size.