Mass function of red sequence (upper panels) and red galaxies plus BCG (lower panels) of MACSJ1206 in various clustercentric radial bins, as detailed in the panels. The arrow indicates the total mass inside the considered radial bin, disregarding the BCG, if any. The solid line is the mean model fitted to the individual galaxy data, while the shading indicates the 68% uncertainty (highest posterior density interval). Points and approximated error bars are derived by binning galaxies in magnitude bins, adopting approximated Poisson errors summed in quadrature, as commonly done in the literature.