Fig. 3
Stacked X-ray spectrum of the 33 Type-2 QSOs with a spectroscopic redshift (left) and 79 Type-2 QSOs with only a photometric redshift (right). Adjacent bins were combined until they had a significant detection at least as large as 1.5σ. The solid line is the best fit to the continuum with a wabs*zwabs*powerlaw XSPEC model. In the left panel, clear residuals are present around the rest-frame 6.4 keV energy.
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