Fig. 2
Main beam temperature, Tmb (K) versus velocity for [N II] (red) and [C II] (blue) (right axis and scale) and the corresponding Hnα RRL spectra(black) Tmb (mK) (left axis and scale) for eight LOSs (G020.9+0.0 to G028.7+0.0) at b = 0.°0. [N II] was not detected at G025.2+0.0, and was marginally detected towards G021.7+0.0 at two velocities centered on ~25 and 67 km s−1.
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