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Fig. 3

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Left panels: surface gravity as a function of effective temperature for stars in the CA sample (open squares) and in the GR sample (blue filled squares). In the upper panel only metal-poor stars ([Fe/H < − 1 dex) are plotted, while in the lower panel stars have [Fe/H] > − 1 dex. Right panels: the surface gravity is plotted as a function of [Na/H], with the same symbols and metallicity ranges used in the left panels. Na abundances are corrected for departures from LTE according to Gratton et al. (1999) in both samples.

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