Redshift distribution of the simulated sources in Bonaldi et al. (2019) catalog: the blue histogram corresponds to the total number of sources; the red histogram corresponds to the AGN component only. The solid black line shows the redshift distribution of the sources in the EN1 field. For a proper comparison the y-axis represents the source density in each catalog. Each panel corresponds to a different flux density bin, increasing from left to right and from top to bottom. Redshift bins range from Δz = 0.14 to Δz = 0.22 from the faintest to the brightest flux bin, i.e., they are larger than the estimated photometric redshift scatter by a factor 2− 3 for AGN andby a factor ≥7 for galaxies. We caution that the EN1 redshift distributions are reliable only up to z ~ 1.5 for galaxies and up to z ~ 4 for AGN.