Kippenhahn diagrams. These figures show the evolution of the interior stellar structures of the single (top) and binary-stripped star (bottom) models with initial masses of 11 M_⊙ as a function of time until core collapse. Single and double hatching indicates overshooting and convection, respectively. The colors mark the difference between the specific energy generation rate, ϵ_nuc, and the specific energy lost due to neutrino emission, ϵ_ν. For each model, a vertical dashed blue line marks the moment when we switch to a nuclear network of 128 isotopes.