Channel maps of SO 9(8)−8(7) obtained with the JCMT, with the central velocities given in km s-1. The emission from IRAS 4C appears at higher velocity channels (from +7 to +8 km s-1), while IRAS 4-SWC is observed at lower velocity channel (+5.6 km s-1). The peak north of IRAS 4A at about +7 km s-1 can be associated with an outflow or shock from IRAS 4A.
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