Left panel: projected density distribution for galaxies, split into three percentile ranges. Middle panel: projected positions for bright galaxies. The colour palette ranges from red to blue, spanning the V_R,h range defined in Sect. 2. Right panel: similar plot for dwarf galaxies in the sample. The black asterisks indicate the positions of NGC 3258 (south-west) and NGC 3268 (north–east). In both panels, the origin of the black circle is the bona fide centre of the cluster, and its radius is 30′.