Fig. 2.

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Distribution of cluster redshifts from the parent SPIDERS sample (Clerc et al. 2020) used in this study. The clusters constitute a subsample of 1066 objects from the parent sample of 2740 for which MgII absorption lines would fall within the observed SDSS spectral range. The dotted line represents the mean redshift of the clusters at z = 0.41.
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