Sky map of all catalogued galaxies (black). The galaxies with known redshifts are indicated by larger coloured dots in six different z intervals. The redshift intervals are indicated at the top of each panel, where and σ_z are the mean and the standard deviation, respectively, of the redshifts for the spectroscopic cluster members (Table 2). Top row: the colours highlight the cluster members (red) and the one foreground galaxy (green). Bottom row: background galaxies are labeled blue.