Fig. 10

a) [Ca/Fe] as a function of [Fe/H]. Filled triangle and filled square indicate our two brightest RGB stars, RGB stars 12 175 and 42 241, respectively. The error-bars represent the error in [Ca/Fe] and [Fe/H], respectively. b) Same as a) but with a compilation of the Milky Way disk and halo stars abundances from Venn et al. (2004), as indicated by small dots.
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