Color maps showing the velocity-integrated (over the range 103–118 km s−1) intensity (left panel) and intensity-averaged velocity (right panel) of the SO2 v = 0 16(1,15)–15(2,14) transition in core A1. The wedges at the top of the panels give the amplitude scale of the maps. In the left panel, the two white contours mark the integrated intensity level of 0.37 Jy beam−1 km s−1, and delimit two areas of prominent SO2 emission. In both panels, the magenta and black contours, and the yellow squares have the same meaning as in Fig. 5. In the right panel, the white dots mark the channel peak positions of the H30α line emission. The dashed black line marks the axis of the spatial distribution of the H30α peaks.
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