Top: X-ray spectrum of the nebula extracted from a 15–150′′ annulus region shown in Fig. 2 focused on the thermal emission with MOS1, MOS2 and PN spectra represented in black, red, and green. The same spectral model as in Fig. 3 is overlaid. Bottom: same spectra as in the top panel but with the PN response matrix modified by the gain response model implemented in Xspec.
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