Galaxy density maps for cluster members in the SDSS catalogue (colours) in different photometric redshift cuts: 0.40–0.44 (upper left); 0.44–0.48 (upper right); 0.48–0.52 (lower left); and 0.52–0.56 (lower right). The cyan contours overlaid mark the significance of each density peak at 3, 4, and 5σ, respectively. The black contours show the X-ray distribution and the red circles and letters mark the three components.