Least-χ2 fits to the HCN and HCO+ outflow emission using RADEX radiative-transfer modelling, assuming a clumpy outflow consisting of 10 M⊙ clouds at T = 50 K. Red contours correspond to the red wing, and blue/cyan to the blue wing. Contours indicate 2σ (solid blue) and 3σ (dashed red and cyan) confidence levels. The black vertical lines show the radii of the individual clouds. For the HCO+, no red wing fits are made owing to contamination by vibrational HCN lines.
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