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Fig. 12.
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Comparison of SNR 3351-5, SNR 4449-1, SN 1979C and the recently discovered WB92-26 in M31 by Caldwell & Raymond (2023). Solid lines are smoothed spectra, shaded represents the original spectrum. Vertical lines indicate different emission lines; [O III] (cyan), [OI] (magenta), Hα (red), [S II] (pink) and [OII] (yellow).
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