Fig. 3
PACS 100 μm image of the nebula obtained using the MADmap reduction algorithm. The size of the image is 10′ × 10′. The scale on the bottom corresponds to the surface brightness (arbitrary units). North is up and east is to the left. A faint extended elliptical nebulosity is seen around the bright shell, the size of which is marked with the horizontal and vertical bars. Both appear located inside a cavity in the interstellar medium.
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