Average spectra of the sub-mm/FIR lines observed in the present work. Each average spectrum is made out of 46′′ spatial resolution data cubes and within the area covered by the Herschel-HIFI observations. Vertical dotted lines show the loci of the 3 kpc, 4.5 kpc, and local arm spiral features at ~−55 km s-1, ~−30 km s-1, and ~−5 km s-1, respectively.
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