Colour-magnitude I_E − H_E vs H_E diagram. The red dots represent the 60 spectroscopically confirmed cluster members that we employed to fit the RCS, whereas the four cluster members we discarded due to the clipping are in blue. The green dots are the photometric galaxies added to our cluster member sample. The solid red line is the best-fit RCS, while the dotted ones define a range of ±σ_RCS (used for the selection of the cluster members) and ±3σ_RCS (used for the clipping) around the line, respectively.