Peak velocity of the Gaussian fit of the 13CO data (top panel) and the HISA data (bottom panel), respectively. The HISA are extracted by using a second order polynomial to estimate the background emission. The black contours indicate the integrated 13CO emission at levels of 5 K km s−1. The polygons mark the eastern (around l = 36.5°) and western (around l = 34°) subregions, for which we present the histograms of the peak velocities in Fig. 10.
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