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Fig. 4.


Kiel diagrams (Teff and log g) of the GALAH+TGAS dwarfs. Colour indicates the metallicity [Fe/H] in the top panel, mass in the middle panel, and age in the bottom panel. The sample is a subset of the clean GALAH+TGAS overlap, shown in Fig. 1 and excludes giants with Teff ≥ 5500 Kandlog g ≥ 3.8 dex. Stellar masses increase from the cool main sequence (∼0.8 ) to the hottest turn-off stars (∼2.0𝒨). Stellar ages decrease towards higher surface gravities on the cool main sequence and towards higher effective temperatures in the turn-off region. In contrast to this rather smooth trend, few metal-poor stars stand out with smaller stellar masses and higher stellar ages also at effective temperatures around 6000 K.

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