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Fig. 8
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Map of velocity shift between C180 (2–1) and DCO+ (3–2). Overlaid in black contours is the H2 column density (levels: [1.0,1.5,2.0] × l022 cm−2). The black star represents the position of the protostar and the black plus signs are positions of the lowest velocity shifts, which are used for the mean value.
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