Fig. 1
The 94 dereddened BHB stars and two typical isochrones in the color vs. absolute magnitude plane. The blue points are the BHB stars, the green curve is the isochrone with metallicity of − 2.28 dex and age of 13.5 Gyrs. And the red curve is another isochrone with metallicity − 2.0 at the same age. Both isochrones are obtained from Girardi et al. (2010).
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