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Fig. 2
a) HR diagram for the sample when a)log g is based on Fe i-Fe ii ionization equilibrium and b) when log g is based on Hipparcos parallaxes. Four isochrones at solar metallicity and four different ages (1, 3, 5, and 6 Gyr) according to the Yonsei-Yale models (Demarque et al. 2004) are also shown.
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