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Fig. 3

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(a) PPV (position–position–velocity) Tmb intensity map of 13CO emission in W3/4. (b) PPV velocity map (the velocity at the Tmb peak in each voxel) of 13CO in W3/4. The intensity map on the background panel corresponds to the Tmb projection of the PPV map in that direction. A C-shaped morphology of the gas is revealed by the left panel at lower galactic longitudes.

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