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Fig. 1

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Top: 18.1-μm image contours drawn at 2-σ intervals starting at 5σ (background σ = 0.295 mJy/pixel). Bottom: 24.5-μm image contours drawn at 1-σ intervals starting at 3-σ (background σ = 1.463 mJy/pixel). Note that the 18.1-μm image was taken with Michelle (plate scale: 0.1005′′/pixel) and the 24.5-μm image was taken with T-ReCS (plate scale: 0.089′′/pixel). The images have been scaled to show the same area in square arcseconds.

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