P–V plots of the CH3CN 124–114, 13CH3CN 133–123 and CH3CN v8=1 126–116 lines are presented in the upper, middle and lower panels, respectively. The intensity scale is shown in the wedge on the right of each panel. The cut axis along which positions are evaluated is the major axis of the H30α outflow (indicated with a black dashed line in Fig. 9). To produce the P–V plots, we have averaged the emission inside a strip extending ±0.′′3 above and below the cut axis, including only the HII region and its surroundings.
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