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Sample selection for Sun-like stars from the GALAH DR3 database (Buder et al. 2021). Left: all stars (325 518 in total) with reliable stellar parameters (flag_sp = 0 and flag_fe_h = 0) and S/N > 30 (snr_c3_iraf > 30) on a Kiel diagram coloured by the number density of stars per pixel. The GK dwarfs (102 852) are indicated by a rectangle at the right bottom and further shown on the right panel. Right: those GK dwarfs are further classified into three stellar populations (see Appendix A): thin-disc stars (90439; in green), thick-disc stars (12 161; in grey), and halo stars (252; in yellow). Only thin-disc GK dwarf stars have been adopted for subsequent analysis.

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