Traditional classification compared with the results of the first stage of our ANN automatic classification, for stars near the line of sight to the planetary nebulaAbell 63. Symbols indicate the quality of the spectra: open circles for S/N  >  30, filled triangles for spectra with S/N between 20 and 30, and filled squares for spectra with S/N ratio lower than 20. The size of the symbols is related to the internal error in the ANN classification.