Fig. 4
HR diagram of the studied stars. Only the single normal stars in the shaded region were selected for the present study. Filled circles are for stars in the sample studied by Royer et al. (2007). Open circles, open diamonds and asterisks stand for complementary stars taken from Abt et al. (2002), Levato & Grosso (2004) and Huang et al. (2010) respectively. The evolutionary tracks are from Schaller et al. (1992).
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