Cumulative number of clusters per square degree as a function of flux. Top panel: solid blue (orange) line shows the logN–logS built with the sample of detected (simulated) clusters. The green dashed line shows the distributions of the eFEDS sample (Liu et al. 2022a), the red one denotes the SPIDERS sample (Finoguenov et al. 2020), and the pink one the ECDF-S (Finoguenov et al. 2015). The brown and pink vertical lines locate the eROSITA flux value where the ratio between the detected and simulated populations is equal to 0.5 and 0.8, respectively. Bottom panel: ratio between the logN–logS of detected and simulated clusters. A black dashed line denotes a ratio equal to 1.0.