Comparison between the simulated peak flux distributions of the BATSE, Swift, and Fermi samples. Values were rescaled in the BATSE energy passband (25–2000 keV). The sharp drop in the low-tail distribution of BATSE simply reflects the optimal value of the minimum peak flux F_min obtained with the GA, whereas the same drop for the other two sets was smeared out by the rescaling in the BATSE passband.