Distribution of the quasar photometric models with SDSS photometry in the color vs. redshift plane compared to SDSS quasars with i = 20–22 mag within the S16A-Wide2 coverage. For a description of the quasar photometric models, see subsection 3.3. Left- and right-hand panels are for g − r and r − z colors, respectively. Open squares with error bars indicate the average and 1σ scatter of the model quasar color at each dz = 0.1 bin. Green points indicate colors of each SDSS quasar. (Color online)