[Fe/H] vs. T_eff for the giants (log g < 4.2 dex), with log g determined spectroscopically. Top panel: results obtained with the ELODIE interpolator, and bottom panel: those obtained with the MILES interpolator. The solid red line connects the mean values and standard deviations of the metallicity in 250 K wide bins. The difference with Fig. 3 is that log g was this time determined by the full-spectrum fitting, not by photometry.