Stacking velocity-misaligned HI spectra makes secondary components broader and shallower, but spin temperatures remain unbiased; stacked GASKAP data reveal a 1320 K unstable neutral medium component and spatially stable cold gas temperatures over about 100 pc.
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Considerations with stacking absorption spectra: cold HI gas in cirrus region of the Milky Way
Stacking velocity-misaligned HI spectra makes secondary components broader and shallower, but spin temperatures remain unbiased; stacked GASKAP data reveal a 1320 K unstable neutral medium component and spatially stable cold gas temperatures over about 100 pc.