Fig. 4
Relations between the abundances of the α elements Si (upper panel) and Ca (lower panel) vs. [Na/Fe]. The symbols are as in Fig. 3. In these two figures we compare the abundance measured in the turnoff stars to the abundances measured by Ivans et al. (1999), Marino et al. (2008) and Villanova & Geisler (2011) in samples of bright giants (respectively green +, × and □). The α-elements Si and Ca are overabundant relative to iron.
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