Efficiency of the eSASS detection for extragalactic sources in the eRASS1 simulation. The completeness is measured for simulated objects above the different flux limits for each exposure interval defined in Table 4. Top panels: detection efficiency for AGN detected as point sources (EXT_LIKE = 0). The numbers denote DET_LIKE thresholds. Bottom panels: detection efficiency for clusters. The numbers denote EXT_LIKE thresholds. No additional cuts of DET_LIKE are applied. Left-hand panels: completeness as a function of spurious fraction. Right-hand panels: completeness as a function of contamination. Different exposure intervals are shown in different colors.