Fig. 4
Sky coverage of the redMaPPer and X-CLASS catalogues. The green dots stand for the redMaPPer galaxy clusters (26 138 objects, λ> 20). The black circles indicate the XMM-Newton pointings pertaining to the X-CLASS catalogue (2409 observations); the size of the XMM FOV (30′) is exaggerated in the figure; The red circles flag the X-CLASS pointings that contain at least one redMaPPer cluster within 12′ (223 observations).
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