Comparison in log scale between spectra of H2O(557 GHz) (red) and CO(2−1) (blue) for the six brightest outflows of our sample illustrating the systematicly flatter wings in the H2O line. For ease of comparison, all spectra have been re-centered at zero velocity, and the intensities have been normalized at an outflow velocity of 6 km s-1. The central ± 3 km s-1 part of the spectra have been blanked to avoid contamination from ambient cloud emission.
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