Results of the stacking analysis performed on the C-COSMOS field at the coordinates of the Capak et al. (2015) high-z galaxies given by Barišić et al. (2017, see Table 1). Upper panels: 100″ × 100″ stacked map of the 0.5−2 keV Chandra passband (left) and corresponding count-rate histogram (right). Lower panels: the same for the 2–8 keV Chandra passband. In both histograms, the count-rate frequencies (blue histogram) are shown along their cumulative distributions (red histogram) and their nominal mean (green dot) with 1σ uncertainty.