g′−r′ (upper) and g′−i′ (lower) as a function of host galaxy stellar mass. Filled circles are galaxies with nucleus contrast > 1, whereas open circles denote those with nucleus contrast < 1. The marker size denotes the nucleus contrast (see Eq. (B.1)), with bigger points denoting higher nucleus contrast. The solid lines denote the moving (median) averages of the solid points, which were calculated using a bin width of 2 dex, and moved in steps of 0.2 dex. The shaded regions denote the corresponding standard error of the mean (SEM) in the moving averages. Nuclei with values beyond the axis limits are denoted as triangles along the x-axes. The individual error bars were estimated in Appendix D.