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Fig. 20

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Hα, R, S II and O III images, taken from the LGG Survey. Over-plotted is a circle at the position of source XMMM31 J003923.5+404419 with a radius of 5.′′5 (3σ positional error of the X-ray source). The ring-like SNR is clearly visible in the Hα and S II bands.

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