Abundances trends of [Mg/Fe], [Si/Fe], and [Ca/Fe], as well as the mean of these. Red dots mark our Galactic centre stars; blue dots our local disk star measurements, and magenta triangles mark the [Ca/Fe] measurements (with uncertainties of ± 0.15 dex) of M giants (with Mbol> − 5.5) in the Galactic centre by Cunha et al. (2007). The black small dots are the abundances determinations based on micro-lensed dwarfs by Bensby et al. (2013).
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