Probability density redshift distribution of the selected eRASS:1 clusters and the random points. The panel shows the total number of clusters (randoms) in each redshift bin divided by the size of the bin in blue (orange), normalised by the integral over the redshift range. Two black vertical lines denote the redshift range used in our analysis, between 0.1 and 0.6. The bump in redshift at about 0.8 is due to a filter transition in the measurement of photo-z (see Kluge et al. 2024).