log N-log S distributions for sources within the extragalactic sky. Panel a: comparison of the total sample of eROSITA observed blazars and blazar candidates (black) with the distribution by Giommi & Padovani, (2015, purple). Green and brown show the log N-log S for both classes separately (green: eROSITA observed blazars, brown: observed candidates). Panel b: comparison of the predictions of Giommi & Padovani (2015) for BLLs (light blue) and FSRQs (light red) with eROSITA measurements for BLLs, FSRQs, and BCUs, using the color code of Fig. 3).