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Astron. Astrophys. 339, 897-903 (1998)

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Acknowledgements

We thank Bob Treuhaft and Rene Vermeulen for discussing proper cycle times. In this paper we used observations obtained with the Very Large Baseline Array (VLBA) and the Very Large Array (VLA) of the National Radio Astronomy Observatory (NRAO). NRAO is operated by Associated Universities Inc. under cooperative agreement with the National Science Foundation. For data reduction facilities LOS acknowledges the hospitality of NRAO's Array Operations Center. HJvL and LOS acknowledge support for this research by the European Commission under contract CHGECT 920011, and contract ERBFGECT 950012 respectively.

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© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998
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