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Fig. 1.

image

Intrinsic X-ray luminosity in the 2–10 keV band as a function of the redshift of the Swift type 1 (blue filled squares) and type 2 (red filled circles) samples, the X-WISSH sample (blue open squares), the COSMOS type 1 (gray asterisks) and type 2 (light gray asterisks) sources, the ASCA type 1 (pink open squares) and type 2 (golden filled circles) objects and the XXL type 1 (cyan open squares) AGN.

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