Fig. A.1

Example of a strong soft proton contamination (SPC) affecting the spectral analysis of MCSNR J0529−6653 (ObsID 0700381101). The instrumental background, extracted from FWC data, is shown in the top panel in grey and blue. The spectrum extracted from the BG region is shown in red. The strong flat tail above 2 keV is the SPC, which the instrumental + AXB model cannot account for.
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