Fig. 1.
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Stellar parameters of our programme stars, colour-coded by metallicity, compared to theoretical Dartmouth isochrones of different ages (line styles) and with metallicities [Fe/H] = +0.2, 0.0 and −0.5 (colours). Formal 1σ uncertainties are shown by the error bars. The symbol size is proportional to the angular diameter of each star.
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