Multi-Gaussian fitting of the Hα wavelength range of the spectrum observed on Apr 02, 2003. Upper left: fitting of the spectra where the B-band absorption is not corrected. Upper right: the same except for the B-band corrected observed spectrum. In these two plots, the same Gaussians parameters (apart for the [SII] lines in which intensities are only increased) have been used. Bottom left: narrow lines removed using the DIPSO spline fitting of the broad component, compared with the 3-Gaussian broad-component fitting. Bottom right: comparison of the Hα broad component (after narrow lines subtraction) before and after the B-band absorption correction and the broad component obtained using the DIPSO spline fitting. The blue-peak position is the same, a slight difference is seen in the red peak.