Upper panel: Pan-STARRS r − i vs. r diagram. Small black symbols indicate the galaxies of the photometric catalog, green and magenta symbols indicate member and non-member galaxies of our spectroscopic catalog, large green squares indicate prominent galaxies (BCG-E, BCG-CC, BCG-W, and SG in order of increasing r magnitude). The solid line gives the CMR determined on spectroscopic member galaxies; the dashed lines are drawn at ±0.07 mag from this value and are used to define the photometric members in the Pan-STARRS catalog. Lower panel: same as above, but for Pan-STARRS g − r vs. r diagram. The red solid is drawn at 0.15 mag down to the CMR and is used to discriminate red from blue galaxies.