Main elements and their composition profiles as a function of radius for the donor right before the supernova [top] and the runaway 150 s after the supernova [bottom] for mass coordinates, which remain bound after supernova explosion (< 0.661 M_⊙). In particular, ⁵⁶Ni dominates the mass fraction at the surface of the runaway. The surface helium content of the donor is less than 0.03 M_⊙ as most of it has been accreted by the primary.