Fig. 2
Distribution of our observed sources on the Milky Way disk. The source sizes are proportional to their 
line intensity. The thick faint blue lines represent the distribution of the spiral arms (Russeil 2003) in our observed field. The background image is the artist’s view of the Galactic morphology (R. Hurt: NASA/JPL-Caltech/SSC, with a more detailed introduction in Urquhart et al. 2011).
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