Population in the eSASS catalog. The total number of sources detected by eSASS in the eRASS1 simulation (cleaned, see Sect. 3.2) is 1 133 807 (901 812). The number of extended sources is 7731 (5615). Top panel: fraction of sources in the full catalog as a function of minimum detection likelihood. Central panel: fraction of sources in the extent-selected sample (EXT_LIKE > = 6) as a function of minimum detection likelihood. Bottom panel: population in the source catalog as a function of minimum extension likelihood. Lines of different colors show the classes defined in Sect. 3. The dash-dotted lines denote sources that are not contaminated by photons of a secondary source (no blending), the dashed ones identify sources contaminated by a point source, and the dotted ones show sources contaminated by a cluster.