Posterior predictive plot, showing the stellar mass enclosed within 10 kpc as a function of the stellar mass enclosed within 100 kpc of a mock sample of galaxies, generated from the maximum-likelihood values of the hyper-parameters of our single Sérsic profile-based model. Bottom panel: sample split between galaxies that live in halos more massive than 10¹⁴ M_⊙ (red squares) and those that live in less massive halos (grey dots). The red and black lines are the best-fit linear relations between M_{*, 10 kpc} and M_{*, 100 kpc} for the more massive halos and less massive halos, respectively. Middle panel: data points from the bottom panel are colour-coded according to the total stellar mass. Top panel: same as the bottom panel, but with a 0.1 dex random error on the stellar mass measurements.