Fig. 2
Histograms of the redshift distributions for BL Lac objects (left panel) and flat spectrum radio quasars (right panel). The contribution of 1FGL sources detected with a significance down to 
in the BAT 15−150 keV all-sky map (filled columns) is compared with that of the whole corresponding population reported in the BZCAT (empty columns). The contribution of sources included in the 2PBC catalogue is emphasised by an unspotted colour.
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