Overview of the main sequence evolutionary tracks of late O-type and early B-type stars for masses of 12 − 35   ℳ_⊙ (with a step of 0.5   ℳ_⊙) and a core overshoot parameter α_ov = 0.2 pressure scale heights. Grid-points that fall within the error boxes of the primary and secondary components are shown with cyan and blue shading, respectively, on the log T_eff − log g (upper left), log T_eff–log L (upper right), log T_eff–R (lower left), and log T_eff–age (lower right) diagrams.