Fig. 2.
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Illustration of the pixel tagging scheme for M51. Left panel: RGB composite and green contours of the H II regions detected. Middle: Same composite, but with “dusty regions” marked by green contours. Right: Pixel tags, where the labels −1, 0, 1, 2, 3 mean respectively: not galaxy data, unlabeled region, H II region, dusty region, and deblended galaxy (M51b, in this case).
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