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Fig. 9

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Logarithmic histograms showing the frequency of known AGN redshifts in the surveys of Bird et al. (2010; continuous line) and of Krivonos et al. (2010; dashed line), together with the logarithmic distribution of redshifts of AGNs identified in the present paper (shaded histogram; note that for this latter case the actual numbers are multiplied by 10 for the sake of comparison).

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