Fig. 3
Distribution of sources in the rest-frame 2–10 keV luminosity-redshift plane for a) Type I and b) Type II objects. Sources in the main sample are indicated in black and the 23 sources in the bright sample are given in red. Luminosity boundaries for investigating spectral variations are indicated by dashed lines (Sects. 5.1.1, 5.2.1). Redshift boundaries at z = 1 and z = 2 are also indicated for the Type II objects.
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