Hertzsprung-Russell diagram. The black lines indicate the evolutionary tracks computed with rotational mixing of the core (Ekström et al. 2012) for the masses M = 2.0 M_⊙, 2.5 M_⊙, and 3.0 M_⊙. The blue and red lines denote the interpolated evolutionary tracks for M = 2.42 M_⊙ and 2.49 M_⊙, respectively. The filled circles mark the location for an evolutionary age Myr, where the sum of the stellar radii is ΣR^r = 8.51 R_⊙, and the open circles denote Myr, for which .