Map showing the different involved surveys. The gray level disks are the 11′ central areas of the XMM pointings (exposure time depends on the greyness). Large squares show the spectroscopic VVDS-deep and Subaru Deep surveys, and the CFHTLS D1 field. C1, C2, and C3 clusters are also shown. Above a declination of −3.6 deg, only g′,r′,z′ coverage is available, hence no photometric redshifts are derived for this zone.