Position of the ten best models for the spectroscopic case for different choices of alpha concerning the observations, with the observational values including error bars given as black triangles. The evolutionary tracks of the primary and secondary for the best-fitting case are given in (dashed) orange lines. These two evolutionary tracks correspond to models with α_MLT = 1.5, Z = 0.004 and masses of M₁ = 1.39 M_⊙ and M = 1.37 M_⊙.