Mosaic X-ray image of the 14 deg²XMM-Newton sky survey. The false color image was constructed from the surface brightness in the 0.3−0.5, 0.5−2.0 and 2.0−4.5 keV bands. The white region (F) marks the 6 deg² core of the survey presented in this work. Regions A, B and C constitute the extension of the survey by mosaic mode observations. The missing fields have significant losses due to soft proton flares. Bluer fields are affected by enhanced background. Green circles mark the positions of the present cluster sample and have a radius equal to r₅₀₀.