Figure 18: Stacked background-subtracted Chandra counts as a function of rest-frame energy for sources with low (a) and high (b) IR luminosity (black filled circles). The cyan dashed lines (stars), blue dashed lines (open squares), red dashed lines (open circles) and green dashed lines (open triangles) show the same model components as in Figure 16. The resulting summed spectra (black solid lines) are in very good agreement with the observed counts. The strong detection in the stacked spectrum at  keV, in particular at the higher IR luminosities, confirms the presence of a significant number of heavily obscured AGN in these samples.