Comparison of absorption spectra toward G10.62-0.4 obtained with Herschel (p-H2 O and HF) andwith ALMA (HCO+ and HOC+) at the same velocity resolution of 1 km s−1. The spectra have been displaced vertically for clarity. The HOC+ spectrum is scaled by a factor of 10. The velocity range between − 10 and 10 km s−1 corresponds to the molecular gas associated to the G10.6-0.4 H II region, while the foreground absorption can be seen between 10 and 50 km s−1. Despite the huge difference in angular resolution, the absorption spectra are very similar.
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