Cumulative radial distribution of color selected red galaxies (as in Fig. 2) as a function of cluster-centric distance (blue solid line). Dashed vertical lines indicate the radii used for color coded symbols in Fig. 2, the solid line marks the fiducial cluster radius. The dotted blue line shows the cumulative radial red galaxy number counts normalized to the enclosed area, i.e. the average red galaxy density per square arcminute within the cluster-centric distance r.