Decimal logarithm of the intrinsic rest-frame 2–10 keV X-ray luminosity versus redshift, and the projected distributions of these quantities for different sub-types of AGN (see text). Distributions are normalised such that the sum of the heights equals 1. Symbols, line styles, and colour codes of this figure depend on sub-type (see Sect. 3.2) and will remain the same for the rest of the work.