Selection function as a function of redshift for three different luminosity bins. The blue, orange, and green dashed lines denote the selection function for quasars with −27.6 < M1450 < −26.9, −26.9 < M1450 < −26.2, and −26.2 < M1450 < −25.5, respectively. The red solid line represents the selection function over the whole magnitude range. The shaded region shows the redshift bin we used for calculating QLF.