Left panels: 2MASS (K_S vs. (J−K_S)) colour−magnitude diagram of Gaia1 (grey points) with the position of our targets (red points) and those of S17 (blue points). Right panels: position of the MIKE and HERMES targets in the T_eff−log g plane, superimposed on a theoretical isochrone by Bressan et al. (2012) with [Fe/H] = 0.0 and age 3 Gyr. Unexpectedly, the S17 stars do not define an RGB in the theoretical plane, suggesting that their parameters are not correct.