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Fig. 16


Top panels: [Mg/H] ratios as a function of [O/H] and [Na/H] for stars in NGC 1851 with GIRAFFE spectra. Bottom panels: [Si/H] ratios as a function of [O/H] and [Na/H]. In each panel, the internal error bars are indicated. Stars are color coded according to their metallicity as in previous figures.

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