Fractional difference between predicted and observed number of AGN in a luminosity-redshift bin (color scale). The computation of the volume and luminosity function was performed on a 1000 × 1000 grid. The plots are rebinned on a 25 × 25 grid. Top and right-hand panels show the distribution in redshift and luminosity, respectively. The histograms represent the data, while the black lines are the model estimation.