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Fig. 4.
Same as Fig. 3 but for a 30 M⊙ model at 0.2 Z⊙ metallicity. For the donor radii R ≳ 1400 R⊙ the outer envelope becomes deeply convective during a core-helium burning stage, which causes a significant decrease in the binding energy of the model (Fig. 1) and an increase in the post-CE separation apost-CE.
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