Background-subtracted densities of cluster galaxies of XDCP J0044.0-2033 in the J − Ks versus Ks (top) and i − Ks versus Ks (bottom) color magnitude diagrams based on the data shown in Fig. 12. The cluster region was constrained to a radius of 30′′ from the X-ray centroid. The contours and the corresponding filled regions correspond to detected cluster galaxy densities of 3 (orange), 5 (red), 7 (green), 9 (blue), 11 (dark blue) in units of galaxies per arcmin² per mag in Ks per 0.2 mag in J − Ks for the top panel and densities of 2.3 (orange), 3.6 (red), 4.9 (green), 6.2 (blue), 7.5 (dark blue) galaxies per arcmin² per mag in Ks per 0.4 mag in i − Ks for the bottom panel. The sharp truncation of the cluster red-sequence at Ks ~ 20.5 and the significant population of faint blue galaxies in the lower right corner are clearly visible. Lines have the same meaning as in Fig. 12.