Fig. 3
Examples of sources in different classes are shown from left to right: massive clumps hosting embedded UC-H II region, infrared-bright source, and an infrared-quiet massive clump. The background image is a three colour composite image from Spitzer 3.6 μm (blue), 8 μm (green), and WISE 22 μm (red) band images. Grey contours show the 870 μm emission from ATLASGAL. White labels show the source name, the classification of the source, and a bar shows the physical scale considering the distance of the source.
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