Fig. 3
Top: comparison between the integrated [Fe XIV] emission (purple) and integrated [O III] λλ4959, 5007 Å emission (green). The red star marks the proper motion center of the O-rich ejecta derived by Finkelstein et al. (2006). Bottom: idem, but with the Chandra ACIS 1.1 → 2 keV X-ray flux instead (ACIS image credits: NASA/CXC/MIT/D. Dewey et al., and NASA/CXC/SAO/J. DePasquale). The full extent of the X-ray shell is traced with a white contour.
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