As Fig. 4 with evolutionary models including rotation from Ekström et al. (2012). The red bold part of the tracks corresponds to 3.3 < log g < 3.7, the range covered by the sample stars. Left panel: evolutionary tracks with initial masses 25, 32 and 40 M_⊙ and an initial rotational velocity of ~300 km s^-1. Right panel: evolutionary tracks with an initial mass of 32 M_⊙ and various initial rotational velocities.