Performance of FORESTFLOW in recovering P_3D and P_1D for test simulations not included in the training set. Lines and shaded areas display the average and standard deviation of the results for 11 snapshots between z = 2 and 4.5, respectively. From top to bottom, the rows show the results for the CENTRAL, SEED, GROWTH, NEUTRINOS, CURVED, and REIONISATION simulations, where the CENTRAL and SEED simulations are at the center of the input parameter space and employ the same and different initial distribution of Fourier phases as the training simulations, respectively, the GROWTH and REIONISATION simulations use a different growth and reionization history relative to those used by the TRAINING simulations, and the NEUTRINOS and CURVED simulations consider massive neutrinos and curvature. The efficiency of FORESTFLOW is approximately the same for all simulations.