In this figures we plot the values of the difference, Δ, between spectral features in the observed and model spectra, averaged over all the spectra of the wings sample with an acceptable spectral fit (χ² < 3). On the left panel we show the differences calculated for the continuum flux (both observed and model spectra have been normalized to 1 at 5500 Å), and on the right panel for the equivalent width of the lines. Red points represent the average value of Δ, for each one of the continuum bands and emission lines that were used as constraints in the fit. The red errorbars are the corresponding rms, while blue ones are the average of the observed rms.