Quasar luminosity function measurements (black circles). The best-fit models of this work are shown as the red (respectively blue) curves for the PLE+LEDE (resp. PLE) models. The green dot-dashed curve is the LF of Croom et al. (2009). The plain cyan curve is the best fit LEDE model of Ross et al. (2013) at z> 2.2. The orange dotted and dashed curves are the best fits to COSMOS data (Masters et al. 2012) at z ~ 3.2 (shown in the last two redshift bins) and z ~ 4.0, respectively. The magenta dashed curve (almost exactly overlapping the orange dotted curve at the faint end in the 3.0 <z< 3.5 redshift bin) is measured at z ~ 3.2 from SWIRE and SDSS (Siana et al. 2008).