Comparison between a model spectrum calculated with ADS and the spectra created with the neural networks. Top panel: the normalised spectrum of an ADS model with T_eff = 18 500 K and log(g) = 3.10 (grey line) is compared to the spectrum created with the neural network from the B₁ region with the same parameters (black line). Middle panel: difference between the two spectra. Bottom panel: difference between the ADS model spectrum and the spectrum created with the neural network from the B₂ region.