Fig. 6
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Distributions of 1493 training RGB stars (left panels) and 2499 training RC stars common to LAMOST and Kepler (right panels) on the [Fe/H]-[α/Fe] plane colour-coded according to stellar age (top panels) and mass (bottom panels). Here, the values of [Fe/H] and [α/Fe] come from the value-added catalogue of LAMOST DR8 (Wang et al. 2022).
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