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Fig. 10


Colour-colour diagram of Hercules PM-selected stars and spectroscopic targets. Symbols are the same as in the Fig. 8. The isochrone with age t = 13 Gyr and [Fe/H] = −2.27 from the BaSTI database (see text) and the corresponding ZAHB are also shown as red and blue lines, respectively. An arrow indicates the reddening vector.

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