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Astron. Astrophys. 323, 357-362 (1997)
Acknowledgements
We are grateful to Nicole Jacquinet Husson and Claude Camy-Peyret for providing us molecular data on H2 O and for their advice. Our thanks go also to J. Cernicharo, the referee, whose comments helped to improve the paper.
© European Southern Observatory (ESO) 1997
Online publication: June 5, 1998
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