Top: radial profile of the surface density of Chandra sources in the spatially complete sample that have a VISTA match with J< 18 in different rings around the optical cluster center. The horizontal blue line and the parallel dashed lines show the mean value and the uncertainty of the source density outside the 7 arcmin region. Bottom: radial profile of the surface density of all VISTA source with J< 18 in different rings around the optical cluster center. The horizontal line and the parallel dashed lines show the mean value and the uncertainty of the source density in several comparison fields.