Fig. 5
Position-velocity (PV) diagram of the NH3 (1, 1) main line along the gray solid poly-line in the left panel of Fig. 3. The cut runs through the ISF with negative offsets referring to the southern part of the filament. Offset 0 refers to the location of the Trapezium cluster. The threshold and step of the contours of the position-velocity diagram are all 10% of the peak flux.
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