Astron. Astrophys. 354, L1-L5 (2000)

Acknowledgements

We are grateful to Roberto Neri for his help during the data reduction and analysis, all the IRAM staff for providing us with excellent data and the referee, Francoise Combes, for helping in the interpretation of these observations.
Part of this work was supported by the CNR contract progetto strategico "Astronomia Submillimetrica" del Comitato Scienze Fisiche . P.A. thanks MPE for hospitality during 1999 when this work was done.
We dedicate this paper to the memory of the 25 people who lost their lives in the tragedies of the Plateau de Bure cable-car and helicopter.

© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000
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