Fig. 3
Top: PV map of the decomposed GRS data set. The emission was integrated over the full Galactic latitude range (± 1.1°). When displayed in Adobe Acrobat, it is possible to switch to the map of the original data set. Bottom: map of the normalised residual values. Overplotted on both panels are positions of spiral arms, spurs, and local Galactic features from Reid et al. (2016).
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