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Fig. 13

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First moment map of the OCS(19−18) transition. The black solid contours show the 1.3 mm continuum emission. Black squares mark the B1, R1 and R2 positions of Fig. 1a. The other symbols are as in Fig. 4. The systemic velocity of the source lies between −3.4 and −2.5 km s-1 (see Sect. 5.2).

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