Single sideband WBS spectra of [N ii] 205 μm and [C ii] 158 μm towards W 31C. The νLSR of the H ii region is marked in blue and the velocity of the line-of-sight gas is marked in red. Absorption of N+ traces the warm ionised medium, while the C+ absorption mainly traces the cold neutral medium, and, at ≈7–10% level also the WIM.
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