Top: intrinsic, absorption-corrected luminosity in the 0.5–2 keV (left) and 2–7 keV (right) band as a function of redshift. Sources with a spectroscopic redshift are plotted with circles, while sources with only a photometric redshift are plotted with crosses. Sources with a BL–AGN or NL–AGN spectrum or with a SED best-fitted with an AGN template are plotted in blue, while sources with a ETG or ELG spectrum, or with a SED best-fitted with a galaxy template are plotted in red. We also plot, as a black solid line, the luminosity corresponding to the flux at which 10% of the field is covered. Bottom: same as above, but for the spectroscopic subsample alone. BL–AGNs are plotted as blue circles, NL–AGNs as red squares, emission line galaxies as cyan diamonds, and early-type galaxies as orange stars.