Ejecta models used in this work. Panel a: density profiles for our model sequence. Transition velocity, delta, and n parameters are given for each model. Densities for a sample of explosion models are shown for comparison: W7 (Nomoto et al. 1984), DDT N100 (Seitenzahl et al. 2013), DEF N1600 (Fink et al. 2014), VM (Pakmor et al. 2012). Panel b: illustrative composition profile for one model (v12500_d0_n8_s9.7). The three zone structure is clearly demonstrated, with representative species shown. Panel c: ⁵⁶Ni distributionsfor one density profile (v12500_d0_n8). ⁵⁶Ni distributions for a sample of explosion models are also shown.