Color-magnitude diagrams. Upper row: Color-magnitude diagrams of the sz sample (panel a) and the pz sample (panel b). Lower row: Contours show the distribution of galaxies with n > 2.5 (red) and n < 2.5 (blue) for the sz sample (panel c) and the pz sample (panel d). All the contours are drawn at [0.1, 0.5, 3, 10, 30, 80, 99]% of the peak density. The dashed line indicates a fiducial separation between red sequence and blue cloud galaxies, g − r = −0.023 × M_r + 0.15, determined by the eye. Although most galaxies with high Sérsic index are located in the red sequence, the two definitions of the type clearly select different samples of galaxies.