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Fig. 2


a) first-order moment map (colour scale) of the NH3 (1, 1) main group of hyperfine components. Same contour levels as in the left panel of Fig. 1 are shown. The synthesised beam of the NH3 (1, 1) VLA observations is shown in the bottom-left corner. The symbols have the same meaning as in Fig. 1; b) same as panel a) for the second-order moment.

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