Probability distribution in the HR diagram for the parent samples considered in this work. Top panel: distribution for the CoRoT field, obtained from the full sample of Sarro et al. (2013). Bottom panel: distribution for the Kepler field, computed from a subselection of Huber et al. (2014) with a metallicity −0.2 dex < [Fe/H] < 0.2 dex. The red–green–blue color gradient in the map represents decreasing probability; the high end is the red part of the gradient. Solid lines indicate the 1 Gyr isochrone of Ekström et al. (2012), and dashed lines illustrate the 1 M_⊙ theoretical track provided by the same authors. The Sun is represented by its standard symbol. The ellipses around the solar location depict the subsamples of Sun-like stars (Sun-like samples). These were selected equally within the typical uncertainties in T_eff and log g for each parent sample for observed and synthetic data (see text).