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Fig. 4
The spectra around 90 μm, covering p-H2O at 89.988, CH+ at 90.02 and CO at 90.163 μm. The only sources with clearly detected lines are AB Aur (CO), HD 97048 and HD 100546 (CH+ and CO). HD 100546 is scaled by a factor of 1/4, to ensure that the emission lines fit in the plot window.
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