X-ray luminosity and redshift of the X-ray sources. Top panel: X-ray luminosity as a function of redshift for the 1236 X-ray AGN of our sample. Red circles present sources with spectroscopic redshifts available and blue circles those with photometric redshifts. Bottom panel: redshift distributions of photo-z and spec-z sources. The majority of X-ray sources have spec-z at z < 1, whereas at z > 1.5 most of the sources have photometric redshifts.