B_j–R vs. R diagram for galaxies extracted from the SSS. Small circles indicate galaxies within a radius of 4′from the BCG and used to fit the CMR (solid line). The dashed lines are drawn at  ± 0.25 mag from the CMR to delimitate the region of “likely cluster members”. Large blue circles indicate galaxies within a radius of 4′from the SSW peak. The green and red arrows roughly indicate predicted colors for early-type galaxies at z = 0 and z = 0.2, respectively.