Dependence of the extent of ⁵⁶Ni mixing in velocity space on the hydrodynamic properties of the progenitor for models B15-2, W16-3, W18, W18r-2, W18x-2, W20, and N20-P (Table 3), whose explosions have similar energies. The uncertainties in this ⁵⁶Ni mixing are related to estimates of the velocities of the ⁵⁶Ni ejecta containing 93% and 99% of the total ⁵⁶Ni mass. Numbers give the helium-core masses of the corresponding progenitor models.