Distribution of the main-sample quasars in the luminosity (absolute i-band magnitude k-corrected to a redshift of 2) and redshift space. This sample is constructed from the SDSS DR16 quasar catalog—the latest release of SDSS quasar spectra (Lyke et al. 2020); quasars in this sample either have their physical properties estimated by Shen et al. (2011) or have their C IV emission-line properties measured by Rankine et al. (2020).