Fig. 6.
Relations between Fe, Mg, Si, and Na abundances of first and second generation stars. Symbols are the same as in Fig. 5. Typical error bars are included. We point out, as a caveat, the small number of in situ globular clusters in the studied sample. Likewise, we refer to Nissen & Schuster (2010) where the reader might find some support for the idea that [Na/Fe] is related to an accretion origin.
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