Zoom over three simulated eROSITA extragalactic survey fields (equatorial, intermediate and deep, from left to right) in the 0.5–2 keV band, free from galaxy clusters (i.e. containing only backgrounds and AGNs as point-sources). North is up and east left; each dashed square has sides of 15′ in length. The blue circles have a radius of 0.5′ and show the position of the detected sources. The pixel scale is 4″ and identical grey scales are applied to each image to emphasise the differences in sensitivity.