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The first detailed map of the far-infrared [C II] 158 μm line emission from the Galactic plane was obtained using a balloon-borne telescope: BICE. The map covers wide areas of the Galactic plane (255°≤l≤25°, |b|≤3°) with an effective spatial resolution of 15′. We have detected strong [C II] emission from most of the regions we observed. We also obtained a position/central-velocity map of the [C II]...