Fig. 1
Top panels: counts distribution for the HBSS (left) and the BSS (right) samples. Empty histograms correspond to type 1 AGN and dashed histograms to type 2 AGN. Filled histogram for the BSS corresponds to BL Lacs. Bottom panels: X-ray intrinsic luminosity versus redshift for the HBSS (left) and the BSS (right). Squares and circles correspond to sources classified as type 1 and type 2 AGN, respectively. Triangles on the BSS sample represent BL Lacs.
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