Fig. 4
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Red- (left panel) and blueshifted (right panel) CO (2−1) gas condensations detected in DR21. The velocities of the blueshifted emission range from −25 to −101 km s−1, and those of the redshifted emission range from +20 to +69 km s−1. The velocities are expressed with respect to the molecular cloud velocity. We identified nine redshifted and ten blueshifted filaments, labeled RF and BF, respectively. The possible origin of all the CO streamers is marked with a yellow square.
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