Fig. 2
A 13CO longitude-velocity plot of the Scutum arm in the region l ~ 29° to 33° at b = 0°, where we mark the inner (black solid line) and outer (dashed black line) tangencies taken from Reid et al. (2016) using their fit to the near-far distances. The arrows at the bottom indicate Galactic longitudes of the lines of sight observed in [C ii] and [N ii] with upGREAT and GREAT, respectively.
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