Top: positions of the primary (circle) and secondary (squares) components of α Dra in the Kiel (left column) and HRD (right column) diagrams. The black and blue squares indicate the position of the secondary component corresponding respectively to its photometric and spectroscopic value of T_eff. The MESA evolutionary tracks are shown as lines; the exact values of the stellar mass (in M_⊙ units) are indicated in the plot. The black solid lines correspond to the dynamical masses of the stars and are computed for the overshooting parameter f_ov = 0.005 H_p. The blue track is the best fit to the spectroscopic T_eff of the secondary; the red line indicates a MESA evolutionary track corresponding to the dynamical mass of the primary component and computed with f_ov = 0.010 H_p. Bottom: close-ups of the primary (left) and secondary (right) components of the binary systems.