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Fig. 4

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H-R diagram of the sample. Stars are plotted with different symbols according to their log g, and the same limits are used to define regions from the model gravity: triangles for 4.2 ≤ log g (red), diamonds for 3.95 ≤ log g < 4.2 (orange), squares for 3.65 ≤ log g < 3.95 (yellow) and circles for log g < 3.65. Evolutionary tracks from BaSTI (Pietrinferni et al. 2006), for Z = 0.0198, with overshooting, are overplotted for the indicated stellar masses.

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