Distribution of Fe-rich ejecta from model B18.3 at t ≈ 36 years after core collapse (corresponding to February 2023) as a function of velocity along the y-axis (LoS), ranging from v_y = -2500 km s^-1 (top-left panel, near side of the remnant) to v_y = 3500 km s^-1 (bottom-right panel, far side of the remnant). Each panel shows the Fe-mass density integrated over a 500 km s^-1 velocity interval along v_y , with the corresponding range labeled above each frame. The color scale (top left of the figure) indicates the normalized column density of Fe. The axes represent velocity components in the plane of the sky: v_x (east-west direction) and v_z (south-north direction).