Top: comparison between a representative 557 GHz line profile (BHR71-R, blue histogram and maximum velocity of 40 km s-1) and a prediction from the planar shock model of Flower & Pineau Des Forêts (2010) (red line, shock velocity of 40 km s-1 and nH = 2 × 105 cm-3). The vertical dotted line indicates the ambient cloud speed. Note the very different shapes. Bottom: Histogram of the “outflow peak velocity shift” determined from the 557 GHz spectra shown in Fig. 2. The shift corresponding to the planar shock model in the top panel is 4.2 and lies outside the range of observed values.
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