Fig. 1.
Top panel: bolometric luminosity normalised distributions for WISSH and G09 objects with C IV BI > 0. Middle panel: C IV BI distribution for the WISSH sample and the BAL QSO catalogue from Gibson et al. (2009). Bottom panel: normalised distributions for the 1500−1600 Å S/N values extracted from SDSS DR7 for C IV BI > 0 BAL QSOs in WISSH and in the Shen et al. (2011) QSO catalogue (SH11).
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