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Astron. Astrophys. 320, 594-604 (1997)
Acknowledgements
One of the authors (WJJ) thanks the Osservatorio Astrofisico di Arcetri for offering a fellowship to him, and also acknowledges support from the National Natural Science Foundation of China.
We thank R. Cesaroni and C. M. Walmsley for letting us use the molecular data before publication and their LVG code for the C34 S data.
© European Southern Observatory (ESO) 1997
Online publication: June 30, 1998
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