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Fig. A.1

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Kiel diagram (log(g) versus Teff) for the observations presented in Section 2. The shaded areas are 12 Gyr isochrones obtained from PARSEC models, with metallicity between [Fe/H] = −2.4 (Z = 0.0001) and [Fe/H] = −1.2 (Z = 0.0015).

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