X-ray flux distributions for all 1121 X-ray detected sources (top) and for 262 objects with z ≤ 2.0 analysed in this paper (bottom; see Sect. 2.7). Flux distributions are represented in the 0.5–2.0 keV (dashed red line), 2.0–4.5 keV (dotted blue line), and 0.5–4.5 keV (solid black line) energy bands (left panels), 4.5–10.0 keV (middle panels), and 0.5–10.0 keV range (right panels).