Core view of XDCP J0044.0-2033. Top panel: 45′′× 45′′ color composite showing the Subaru V- (blue channel) and i-band (green) image plus the combined J + Ks image (red) smoothed with a 0.5′′ kernel. The black background was rescaled to gray scale for contrast enhancement. The yellow cross indicates the location of the X-ray centroid, whereas contours and symbols for spectroscopic members are as in Fig. 2. The brightest cluster member candidates without available spectroscopic confirmation are labelled “c1-c3”. Obvious low-z foreground galaxies are marked “f1-f3”, “f4” is a spectroscopically confirmed interloper (z = 0.592), and a foreground star is indicated by “s”. “rs1” (Ks ≃ 20.4) and “rs2” (Ks ≃ 21.2) mark red-locus galaxies at and beyond the found red galaxy truncation magnitude of Ks ≃ 20.5. Bottom panel: 70′′× 70′′ (600 × 600 kpc) color composite based on the same data as above. Small colored circles indicate the color−color selected galaxies as defined in Fig. 16.