Differential number counts in the 0.5−2 keV band normalized to the Euclidean slope. The data points and the dotted line are taken from Georgakakis et al. (2008); dot-dash curve shows the AGN model by Ueda et al. (2003). The bundle of lines shows the present results based on CDFS; thick line – the best-fit solution, thin lines – 1σ statistical uncertainty, dashed lines – maximum total uncertainty range including the potential systematic errors generated by the approximations in the PSF fitting.
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