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Astron. Astrophys. 326, 537-553 (1997)
Acknowledgements
We thank our anonymous referee for useful comments. EB is grateful
to the Service d'Astrophysique at Saclay for inviting him for a month
during which most of the VLA data reduction was performed. PAD thanks
the Departemento de Astronom
a
of the Instituto de Fsica of
the Universidad de Guanajuato (México), for its hospitality,
which greatly helped to getting this paper finished.
© European Southern Observatory (ESO) 1997
Online publication: October 15, 1997
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