Comparison of the mass and redshift distribution of the bright XXL cluster sample with other cluster samples. We detect on average lower-mass / higher-redshift clusters than current Sunyaev-Zel’dovich cluster surveys (Bleem et al. 2015; Planck Collaboration XXVII 2016), as well as the 400 deg2 ROSAT survey based on deep archival pointings. At high redshift, the selection of the XXL-100-GC sample is also much closer to being mass-limited than for ROSAT-based surveys such as the 400d.
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