Evolutionary tracks of primary (left) and secondary (right) models with initial primary masses of 30 (green gray), 45 (blue gray), and 60 M_⊙ (red gray), fixed mass ratio q = 0.85 and initial orbital periods of 5 (solid), 50 (dashed), and 500 d (dotted). We highlighted the WR phase (i.e., τ ≥ 0.2) in bold colors. Equidistant time steps of 0.3 Myr are marked by black dots during the WR stage. In the background, we marked the positions of all observed WR stars in the SMC.