Scale factor vs. surface gravity (based on MIST fits) for the post-MS stars of the HARPS sample. The relation S_HARPS,pMS (log g) for the post-MS stars is fitted with a cubic polynomial (red line). The effective temperature for each star is color coded. The marker shapes correspond to the evolutionary phases according to MIST: sub- or red giant (triangle), core Helium burning (squares), and asymptotic giant (diamonds). A local minimum in scale factor at log g ≈ 3.2 is marked (gray, dashed line).