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Fig. A.2


Channel maps of the emission of the SO 32 21 (color map) and the main component of the NH2D 11,1a 10,1s (white contours) lines. The images have been created by merging the NOEMA data with the short spacing obtained with the IRAM 30 m telescope. The channel velocity is marked at the top of the panel. Red crosses indicate the positions studied in detail in this Letter.

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