Observed [α/Fe] versus [Fe/H] abundance ratios presented by VSA18, compared with our fiducial chemical evolution model (blue line) and the classical two-infall model (yellow line) (see Sect. 4). The purple filled circles are the observed “high-α” stars, whereas the green filled circles are the observed “low-α” stars. The black-purple and black-green contour lines enclose the observed high-α and low-α stars, respectively.
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