Fig. 6
Left panel: distribution of r-band magnitude corrected for Galactic extinction using the Schlafly & Finkbeiner (2011) dust maps for all DR14Q quasars (thick black histogram), quasars observed during SDSS-I/II (cyan histogram), SDSS-III (purple histogram) and SDSS-IV (red histogram). Right panel: distribution of r-band magnitude corrected for Galactic extinction for all CORE quasars (dark blue histogram), CORE quasars observed as part of SDSS-IV only (light blue histogram), all PTF quasars (brown histogram), PTF quasars observed as part of SDSS-IV only (orange histogram), SDSS-IV/TDSS quasars (green histogram), and quasars selected as part of ancillary programs (pink histogram). A given quasar can be selected by several target selection algorithms, hence the cumulative number of quasars in a r-band magnitudebin can exceed the total number of objects in it. The bin size for both panels is Δ r = 0.1.
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