Upper panel: comparison of the four ELODIE spectra for the Sun with S/N >  100 (gray) to the atlas spectrum by Hinkle et al. (2000) (red dashed). The latter was degraded to match the resolution of our training grid and re-sampled to the ELODIE dispersion scale. The blue regions show the fluxes used in one of our [Fe/H] relations. All spectra were normalized to the mean flux in the rightmost blue band. Lower panel: flux residuals.