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Fig. 7
The distance–VLSR relationship for the Scutum arm tangency at l = 31.̊0 derived using the rotation curve of Reid et al. (2014). It shows that the WIM component of the Scutum tangency is from 6–8 kpc, centered at ~7 kpc distance, while the prominent star forming and H ii region, W43, is at about 5.5 kpc.
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