Fig. 3
Artist impression of face-on view of the Milky Way (R. Hurt, SSC-Caltech, MPIA graphic, Tackenberg et al. 2012). H ii regions are shown as red circles, star-forming clouds as blue circles and starless clumps as green circles. Circle sizes are proportional to region sizes. The right panel shows a zoom to the region enclosed by the black rectangle in the left panel, where the source density is highest.
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