Astron. Astrophys. 337, 69-79 (1998)

Acknowledgements

We thank the observatories of the US and European VLBI Networks and NRAO, which operates the VLA and the VLBA. NRAO is operated by Associated Universities, Inc., under cooperative agreement with the National Science Foundation. I. Owsianik acknowledges support from the Polish State Committee for Scientific Research grant nr 2.P304.003.07, EU grant (ERBCIPDCT940087) and Onsala Space Observatory. We thank the referee for his helpful comments. We thank G.B. Taylor for helping schedule the 1993 observations.

© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998
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