Left panel: distribution of AI for the SDSS-DR3 (magenta histogram; Trump et al. 2006) and the SDSS-DR12 (black histogram) quasars. Both distributions are normalized to have a surface area equal to 1 for log AI > 2.5. Right panel: distribution of BI from the DR12Q catalog (black histogram), from the SDSS-DR6 (red histogram; Allen et al. 2011) and from the SDSS-DR5 (blue histogram; Gibson et al. 2009). All the distributions are normalized to have their sum equal to 1.
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