Positions of the components of KIC9850387 on the log T_eff − log g diagram. The red regions corresponds to the best-fitting isochrone cloud (Johnston et al. 2019b) to the dynamical parameters of both components. The black regions on the isochrone-cloud represent the log T_eff − log g values corresponding to the dynamical masses of the individual components. The grey curves are MESA evolutionary tracks with different amounts of core-boundary mixing (solid and dashed), with their corresponding masses (in units of M_⊙) indicated at the base of each track. The inset plots are magnified regions around the position of the primary (top) and secondary (bottom) component.