Kippenhahn diagram for our default 30 M_⊙ model, separating different evolutionary stages as well as showing the evolution of the stellar radii. “He dep.” and “C dep.” stand for core helium and carbon depletion respectively. In addition, we show the result of computing E_bind under the assumption that the core–envelope boundary M_core at which CE would finish is at the innermost mass coordinates where the hydrogen mass fraction is X = 0.1 or X = 0.3. We only show E_bind after the formation of the helium core, so no information is given on the main sequence. To provide a comparison point to rapid population synthesis codes, we also show the resulting E_bind from the fits of Claeys et al. (2014) and Xu & Li (2010).