Composite quasar spectra from SDSS, VanderBerk et al., 2001, AJ, 122, 549
Composite quasar HST spectrum, Zheng et al., 1997, ApJ, 475, 469
Low- redshift Broad Line Spectra (MeanQSO, Seyfert 1, BLRG) with Narrow Line Spectra (Liner, NGC3368, Seyfert 2, NLRG) spectra.
