Spatial distributions of shocked Fe (blue) and Si/S (green) at t = 340 years, in the case of a shrapnel initially located within the iron core (see models with Dknot = 0.15 RSNR in Table 3) and assuming a 20 M⊙ progenitor MS star. The figure shows one octant of the domain (the SN explosion occurred at the origin of the 3D Cartesian coordinate system (x0, y0, z0) = (0, 0, 0)) and the colored regions mark material with particle number density n > 0.03 cm−3. The upper panels show the distributions for different initial density contrasts χn, the middle panels for different initial velocity contrasts χv, and the lower panels for different initial radii of the shrapnel rknot.