Statistics of the spectral residuals (compare to Fig. 13 of Cid Fernandes et al. 2014). Top: the mean normalized spectrum of 170670 bins from 200 galaxies. The mean starlight fit is overplotted in orange, while the mean residual is plotted at the bottom of the panel (purple). Middle: zoom of the residual spectrum, with emission lines removed for clarity. The shaded rectangle encompasses the ±3% area. Bottom: fraction of the bins contributing to the statistics at each λ.