Observed AGN RLF (red circles) fitted in each redshift bin with two parametrisations: PLE (black lines) and PDE (grey lines). The corresponding best-fitting function obtained through MCMC using the analytical form of Mauch & Sadler (2007) is marked with a solid line. The 1000 bootstrapped RLFs (dotted lines) delimit the ±1σ confidence interval on the fit in each redshift bin. Further details are given in Sect. 4.2, and best-fit parameters and uncertainties are listed in Table 2.