Fraction of optically obscured (type 2) AGN as a function of intrinsic X-ray luminosity. The solid green line shows the relation used to separate AGN (Eq. (4), originally from Merloni et al. 2014) into optically obscured/unobscured, while the dashed purple line shows the actual fraction of type 2 AGN in our catalogue (with the Poissonian uncertainty shown by the shaded area). The other two dashed lines give information about the X-ray obscuration (where type 1 X-ray AGN are defined as objects with logN_H/cm^–2 < 22 and vice-versa): the dashed orange line shows the fraction of objects classified as type 2 both in optical and the X-ray, while the dashed red line represents the fraction of all the AGN that are type 1 in both bands at the same time.