Evolutionary state of the primary (left triangle) and secondary (right triangle) at contact or termination for M_1,  i = 8.6 − 20.0 M_⊙. The pink, blue and grey background colours indicate systems that get into contact, avoid contact and fail to converge numerically, respectively. Post-MS stars are those that have exhausted hydrogen but have not yet ignited helium in their core. ‘CHeB’ stands for core helium burning.