Astron. Astrophys. 355, 333-346 (2000)

Acknowledgements

The National Radio Astronomy Observatory is operated by AUI, Inc. under a cooperative agreement with the US National Science Foundation. We owe the staff of the VLA and at the Plateau de Bure our thanks for helping to take the data. The AIPS task UVLSD used to reduce our VLA OH data was written by Eric Greisen.

The comments of Dr. John Black, the referee, were gratefully received.

We dedicate this paper to the memory of six IRAM employees, Bernard Aubeuf, Francis Gillet, Henri Gontard, David Lazaro, Roland Prayer, Patrick Vibert, who lost their lives in 1999, in two terrible accidents.

© European Southern Observatory (ESO) 2000

Online publication: March 17, 2000
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