Comparison of two simulations differing only in spatial resolution (see Table 1): run W15-IIb-sh-HD+dec, calculated on a grid with 1024³ grid points (upper panels), and run W15-IIb-sh-HD+dec-hr, calculated on a grid with 2048³ grid points (lower panels). The figure presents volumetric renderings of the mass density distribution for unshocked O-rich (first two columns on the left) and Fe-rich (last two columns on the right) ejecta, integrated along the LoS, at the age of Cas A. Each image is normalized to its maximum for better visibility (color bar on the top left of the figure). The first and third columns display the volumetric renderings as viewed from Earth’s perspective, corresponding to the negative y-axis (front view). The second and last columns show the renderings from a vantage point along the positive x-axis (side view).