Fig. 5
Left panel: the X-ray to NIR flux ratio F(0.5–2 keV)/F(H) as a function of the X-ray flux for the z > 3 Chandra-GOODS-ERS AGN sample (red-filled circles), Chandra-GOODS-MUSIC sample (black-open circles), Chandra-COSMOS sample (green-filled squares) and XMM-COSMOS sample (blue-filled triangles. Right panel: the distributions of F(0.5–2 keV)/F(H) for the Chandra-COSMOS z > 3 sample (black histogram), Chandra-ERSVO sample (red histogram), and Chandra-GOODS-MUSIC sample (blue, dashed histogram).
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