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Fig. 2


Hi spectrum and Hi channel map around absorption velocity toward G352.6+0.5 and G337.0+0.0, respectively. The dashed line on top of two Hi spectra profiles represents the central velocity of the absorption line. Red crosses below two channel maps represent positions toward G352.6+0.5 or G337.0+0.0. HINSA with real Hi absorption of foreground cold Hi cloud around ~−8.7 km s-1 is clearly seen toward G352.6+0.5. Non-HINSA with pseudo-absorption caused by relatively high brightness temperatures in neighbor velocity channels around ~−21.9 km s-1 is shown toward G337.0+0.0.

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