Variation of the relative contribution of shell burning and winds to the hydrogen envelope depletion rate during the PSS phase, as a function of the initial donor mass. The yellow parts represent the contribution of shell burning, and the green region represents the contribution of winds. Red and blue lines represent LMC and SMC composition, respectively. The shell burning contributes more to the mass depletion of the envelope than the winds. The lines are extrapolated (dotted) to see the extent to which shell burning dominates. In the case of LMC, it is ∼54 M_⊙, and in the case of SMC, it is 63 M_⊙. Above this limit, the winds start to dominate the mass depletion of the envelope.