Fig. B.1
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Spectra of HCO+ J = 1 − 0 obtained with the IRAM-30m telescope towards the sources listed in Table 1. The blue curve in each frame represents the best Gaussian fit to the line. For spectra with two intensity peaks, a double Gaussian fit has been performed. In some cases, the y-axis has been reduced to highlight the (tentative) red- and blue-shifted high velocity non-Gaussian wings.
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