Fig. 3.

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Redshift distribution for the main sample of 677 AGN (top left), and for the five subsamples of AGN selected by means of different techniques: AGN selected via their X-ray properties (top center), AGN selected via their MIR properties (top right), AGN selected via optical variability (bottom left), and Type I and Type II AGN confirmed by spectroscopy (bottom center and bottom right, respectively). Each panel reports the median redshift value for the corresponding sample. Details about the selection criteria are reported in Sect. 2.
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