Pixel-count distribution (black circles) of the Fermi-LAT 6 yr data set compared with the simple 1pPDF distributions of the best-fit models (solid red lines). Poissonian errors ﹩\propto \sqrt{{n}_{k}}﹩ have been assumed in this figure. In the top row, the best-fit results obtained from the Bayesian posteriors are plotted. The bottom row instead depicts the maximum likelihood results. The individual 1pPDF distributions of the three different contributions are also shown, i.e., point sources (dashed black lines), the Galactic foreground (dotted black lines), and the isotropic diffuse background (dot-dashed black lines). The lower panels of the plots show the residuals, given by ﹩(\mathrm{data}-\mathrm{model})/\sqrt{\mathrm{data}}.﹩ Error bars represent ﹩1\sigma ﹩ uncertainties.