Left: cluster structures on the r′-band OSIRIS/GTC image. The contours show the local density distribution of the cluster galaxies at 2, 3, 4, 5, 6, 8, and 10 times the background density noise, and the letters indicate the locus of the four structures detected above the 4σ level with their size proportionally to the detection limit. The red stars show the AGN-candidate positions. Right: density map and spatial distribution of the FIR cluster members. Open yellow circles indicate the MIPS-only emitters and open orange squares represent Herschel-detected sources. The blue cross and dashed blue circle represent the centre and the virial radius of the cluster.