Fits to SDSS stacked spectra. The MILES (in orange) and FASTAR (in blue) best-fitting models are shown compared to two SDSS stacked spectra (in black). The top and bottom panels correspond to stacks of low-σ (110 km s⁻¹) and high-σ (280 km s⁻¹) early-type galaxies, respectively. MILES and FASTAR best-fitting models are very similar as demonstrated by the residual distribution also displayed in each panel. No polynomial correction was applied to the continuum.