The mean spectrum of the synthetic spectra of galaxies that were accepted in each case based on their χ² values from the fitting to SDSS spectra. With black, red, green and blue we represent the cases with χ² limit less than 0%, 0.2%, 0.5% and 1% greater than the minimum χ² value respectively. With light blue the mean spectrum of all the galaxies of each type in the library is presented.