Top panel: envelope composition for model r0 at the onset of core collapse as a function of Lagrangian mass m. The cumulative sum of mass fractions is shown versus depth, starting from light elements. The iron core is the hatched area and its outer edge at 1.55 M⊙ corresponds closely to the adopted mass cut at 1.57 M⊙ for the piston trigger. Middle panel: ejecta composition for model r0e2 versus velocity and Lagrangian mass (the innermost ejecta shell is at m = 0 and the dashed line corresponds to 56Ni). Bottom panel: same as middle but now for model r0e4. The profiles are similar apart from a shift in velocity and a slightly different composition resulting from the explosive nucleosynthesis in the innermost layers (a greater mass of α-rich freeze-out products, including helium, is present in higher-energy explosions).
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