Cumulative number density of the AGN population. Top panel: blue (orange) line shows the logN–logS built with the sample of detected (simulated) AGN. The green, red, violet dashed lines show the distributions from Gilli et al. (2007), Georgakakis et al. (2008) and Merloni et al. (2012). 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 AGN. A black dashed line denotes a ratio equal to 1.0.