Redshift histogram of the matched eRASS1 clusters in the ROSAT, Planck All-Sky Surveys, ACT, and SPT-SZ surveys and the newly discovered eRASS1 clusters. The redshifts indicated here are adopted from the literature catalogs that are matched. For the eRASS1 catalog, z_best is used in the histogram. The largest overlap of clusters (1176) is between RASS and ACT DR5 surveys due to the large common area between the two surveys with eROSITA.