Upper panel: density distribution map integrated along the line of sight (in this case the y-axis) of the run Fe-R5-D750-V7, showing the regions chosen for the spectral synthesis: red for the anisotropy protruding the remnant outline (the clump), black for the wake of the anisotropy, and green for a region of the shell not affected by the anisotropy (the shell). Lower panel: X-ray Chandra ACIS-S synthetic spectra in the 0.5-2 keV energy band for the clump (red), the wake (black), and the shell (green).