u^∗ − r′ versus r′ with red dots being T ≤ 21 galaxies (early types), blue dots being 58 ≥ T ≥ 21 galaxies (late types), and pink dots being starburst galaxies. From top to bottom, figures are for the most massive, the massive, the moderately massive, and the z ≤ 1 C0 clusters. Absolute magnitude computations are based on photometric redshifts. Black continuous lines are the RSs computed with T ≤ 21 galaxies, except for C0 clusters where we had not enough available early-type galaxies.