Comparison between the EWs of Hα, [N II], Hβ and [O III] measured in the SDSS spectra and the predictions made by the ANN on miniJPAS data using the MAG PSFCOR (left panel) and synthetic J-PAS magnitudes obtained from the SDSS spectra (right panel). Black and blue numbers are the median and the median absolute deviation of the difference. Dashed black line is line with slope one.