Average distributions of real (blue), simulated GA-optimised (red), and simulated SS96 (green) BATSE GRB profiles, estimated on the test set (see Table 2). Top left: Average peak-aligned post-peak normalised time profile, together with the r.m.s. deviation of the individual peak-aligned time profiles, F_rms ≡ [⟨(F/F_p)²⟩−⟨F/F_p⟩²]^1/2. Top right: Average peak-aligned third moment test. Bottom left: Average ACF of the GRBs. Bottom right: Distribution of duration, measured at a level of 20% of the peak amplitude (T_20%). In the top left and top right panels, both real and simulated averaged curves were smoothed with a Savitzky-Golay filter to reduce the effect of Poisson noise. In the bottom right panel, a Gaussian kernel convolution has been applied to both real and simulated distributions.