The upper panels display red isosurfaces representing the distribution of Ni-rich ejecta (at a density threshold of 10³ g cm⁻³) at t = 4.53 s after core collapse for model W15-2-cw-IIb (Wongwathanarat et al. 2017), shown from different viewing angles. The corresponding O-rich ejecta are visualized using a blue volume rendering (with opacity scaled to reflect density variations), both in combination with the Ni-rich distribution (upper panels) and independently (lower panels). The bottom right color bar indicates plasma density.