Full width at half maximum (FWHM) of the 13CO emission (top panel) and the HISA feature (bottom panel), respectively. The linewidth is determined by using a single Gaussian fit. The contours indicate the integrated 13CO emission at levels of 5 K km s−1 for reference. The polygons mark the eastern (around l = 36.5°) and western (around l = 34°) subregions, for which we present the histograms of the FWHM linewidths in Fig. 12.
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