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Fig. 2.


Observed density of stars in the [α/Fe] versus [Fe/H] space for the APOKASC stars by VSA18, compared with our chemical evolution model (black solid line) in the solar neighbourhood. Filled red circles indicate the abundance ratios of the chemical evolution model at the given age. The area of each bin is fixed at the value of (0.083 dex) × (0.02 dex).

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