Accuracy of FORESTFLOW in recovering P_3D and P_1D measurements from the CENTRAL simulation at z = 3. Dotted lines show measurements from simulations, solid lines and shaded areas display the average and 68% credible interval of FORESTFLOW predictions, respectively, and vertical dashed lines indicate the minimum scales considered for computing the training data for the cNF. The overall performance of FORESTFLOW in recovering P_3D is 2.0% on scales not strongly affected by cosmic variance and 0.6% for P_1D.