YY-isochrones from Yi et al. (2001) for the metallicity of [Fe/H]  = 0.15. Isochrones are plotted for ages between 1 and 14 Gyr in steps of 1 Gyr (left to right). The ellipses mark the 1-σ and 2-σ confidence ellipsoids for the determined values of a/R_⋆ and T_eff ⋆. The isochrones plotted here have a fixed metallicity only for visualization purposes, and uncertainties on the metallicity are propagated into the uncertainties on the stellar mass and radius.