Composition diagrams showing the core composition inside the helium core at the onset of core collapse for the entire grid of models. The two pairs of rows show single and binary-stripped star models with the same initial masses. All models are scaled such that the radius of the diagram is proportional to the square root of the helium core mass (the helium core mass is indicated at the bottom of each diagram). The binary-stripped model with an initial mass of 19 M_⊙ is not shown because it did not reach core collapse. Colors represent the same isotopes as in Fig. 2.