Kiel diagram of the sample showing the parameters computed with STEPARSYN. Squares depict Hα-active stars. The metallicity [Fe/H]_corr is colour-coded. Lines correspond to 5-Ga PARSEC isochrones with [Fe/H] = −0.4, 0.0, and 0.2 dex (Bressan et al. 2012). Typical uncertainties in logg and T_eff are shown in the bottom-right corner. Outliers in logg are marked with red and blue circles (see Sect. 4 for details).