a) NH₃ (1, 1) integrated emission (white contours) overplotted on the 4.5 μm Spitzer IRAC emission. Contours start at 10% of the peak intensity, (39.03 Jy beam^-1 m/s), and increase in steps of 15%. b) Position-velocity (p − v) plot of the NH₃ (1, 1) emission along the cut at PA 70° and centred on (−5′′, 134) with respect to the phase centre, with positive offsets increasing as shown by the arrow in panel a). c) Idem as panel b) with PA 160°. Centre for both cuts is at position where the cuts intersect. In the p − v plots, contours start at  − 0.003 and increase in steps of 0.0015 Jy beam^-1.