Fig. 3
Upper panel: 68%, 90%, and 99% confidence contour levels of the ISM density and SRCUT break frequency derived from the spectrum of region e. Lower panel: 68%, 90%, and 99% confidence contour levels of the ISM density and the ISM ionization parameter derived from the spectrum of region e. The red curves are isochrones at 100 yr and 250 yr after the interaction with the shock front.
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