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Fig. 1

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Teff − log ɡ Kiel diagram of LAMOST DR9 AFGK-type stars. The black dashed line represents the empirical formula proposed by Zhang et al. (2022), with an effective temperature range of 4800-6800 K; stars within this area are defined as solar-like stars in this work. For reference, the Sun (Teff ~ 5800 K, log ɡ ~ 4.4 dex) is denoted by an orange star. The inset color-magnitude diagram shows the distribution of the training data, which is a subset of stars within the black dashed area, color-coded by [Fe/H],

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