... H₂CS

Based on observations carried out with the IRAM 30-m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).

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... package

http://www.iram.fr/IRAMFR/GILDAS

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... observations

The radial column densities given by the chemical model are multiplied by a factor 2 to get the total column densities across the envelope  $N_{\rm tot}$.

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... respectively

See e.g. http://www.lesia.obspm.fr/crovisier/basemole/

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