Left: a 4′ × 4′ wide z-band image of cluster XDCP J1119.1+1300 – cl02 at z = 0.6764. Symbols and colors have the same meaning as in Fig. A.1. Red squares mark those galaxies excluded from the analysis because their measured redshift is uncertain or because they are rejected by the σ-clipping procedure described in the text. Right: rest-frame velocity histogram of the cluster galaxies. Here the dashed histograms refer to those galaxies with peculiar velocities | v |  < 3000 km s^-1 from z_cl but which are discarded as members by the iterative 3σ clipping process as described in Sect. 3.3.2.