Two-dimensional distribution function of log (p) and in the simulated observations for δ = 16′ and α = 0°. The solid black curve represents the evolution of the mean per bin of log (p). A linear fit is performed, restricted to bins in log (p) that contain at least 1% of the total number of points. This fit is shown as the dashed black line. The dashed grey line is the large-scale fit presented in Sect. 2.5.