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Fig. 1
CMD from Kravtsov et al. (2007). The stars from our sample are indicated by larger red symbols. An isochrone for [Fe/H] ~ −1.2 dex and age of 10 Gyr from the Padova library (Marigo et al. 2008; Girardi et al. 2010) is overplotted for comparison. The three HBs are indicated by black rectangles.
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