CFHT g^Mega–r^Mega vs. r^Mega diagram for galaxies with available spectroscopy. Small/black squares indicate member galaxies and large/red squares indicate nonmember galaxies. Red crosses indicate ELGs. The solid line gives the CMR determined on member galaxies; the dashed line is drawn at  ± 0.15 mag from this value. The green circles indicate the BCGN(NW) and BCGN(SE) of A1758N: these are the only galaxies of the sample that likely suffer for photon count saturation in the CFHT catalog (because they are brighter than r^Mega ~ 17).