Dependence of IA on halo mass for different IA measurements. The halo masses, ⟨M_eff⟩, were obtained as described in the text. We indicate our measurements with star markers (orange: dense sample, green: luminous); the other data points are taken from the literature. The solid black line shows the best fit curve of the A_IA(M) relation described by Eq. (6.1), while the shaded area delimits the 68% confidence region.