Distribution of the model quasars in the g − r vs. r − z color–color plane (solid contour) compared to SDSS quasars with i = 20–22 mag within the S16A-Wide2 coverage. For a description of the model, see subsection 3.2. Green points indicate colors of each SDSS quasar, and dashed contours show the distribution. Left- and right-hand panels are for quasars at z = 2.5–3.0 and z = 3.5–4.3, respectively. There are 1407 and 234 SDSS DR12 quasars in the redshift and magnitude ranges in the S16A-Wide2 coverage. In order not to be affected by the difference in the absolute magnitude, only model quasars in the same magnitude range are plotted. The contours represent 30%, 60%, and 90% enclosing areas. Red arrows indicate the effect of SMC-like dust-extinction with E(B − V) = 0.04 mag. Red solid lines represent the z ∼ 4 quasar selection criteria on the plane. It should be noted that the photometric uncertainty of the HSC is negligible for objects brighter than the SDSS spectroscopy. (Color online)