Projected luminosity density maps, xy, yz, and xz from left to right, with the same FoV and resolution as in Fig. 6. The best-fit snapshot (middle) highlights the region corresponding to NGC 3447A (white ellipse), the snapshot 37 × 10⁶  yr after is at top, and that 37 × 10⁶  yr before down. Left: the projected maps in the M2 Swift filter and right, in the V-band, each normalised to the total flux inside each box.