Same as Fig. 3, for dwarf stars in M67 (NGC 2682). The metallicities are taken from the following publications: Hobbs & Thorburn (1991); Friel & Boesgaard (1992); Shetrone & Sandquist (2000); Randich et al. (2006); Pace et al. (2008); and Santos et al. (2009). Data for the following stars are shown (reference T_eff, number from Sanders 1977): (5750, 746); (5850, 1255); (5900, 1048); (5950, 1256); (6050, 1283); (6100, 1092); (6100, 1287); (6150, 994); (6200, 998); and (6600, 997). The S/N of the spectra used in the different publications is higher than 50, except when stated otherwise. The bars to the right of the legend indicate minimum and maximum uncertainties for the individual [Fe/H] values quoted in the publications.