Fig. 1
Redshift distribution for the 154 XBS AGN1 discussed in this paper (continuous black line) compared to the distribution of the total sample of 276 AGN1 (green short-dashed line). Dotted (red) and long-dashed (blue) histograms indicate the objects whose black-hole mass has been derived using the Hβ and MgIIλ2798 Å lines, respectively.
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