Number (top panel) and relative fraction (bottom panel) of eRASS1 clusters per redshift bin depending on their best redshift type. The total numbers are 8790 photometric redshifts (z_λ, Sec. 3.2), 1759 spectroscopic redshifts determined using the bootstrap method (z_spec, Sec. 3.3), 1451 spectroscopic redshifts of the galaxy at the optical center (z_spec,cg, Sec. 3.3), and 247 literature redshifts (z_lit, Sec. 3.4). Clusters with unflagged velocity dispersion information (Sec. 3.6) have the same distribution as the z_spec sample.