Selected windows for the spectrum of the SNR candidate. The recovered spectrum is displayed with a dark green thick continuum line. Besides, the total spectrum at the location point source under study (‘Inside’, black continuous thin line) and the spectrum used to subtract the background emission (‘Outside’, grey dashed thin line) are also displayed. To better see all the three spectra, the recovered spectrum was scaled by a factor ×4, and the ‘Inside’ and ‘Outside’ spectra are offset by ×0.1 and ×0.2 the peak value of ‘Inside’ in the displayed spectral window.