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Astron. Astrophys. 321, 311-322 (1997)

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We are grateful to the staff of the Onsala Space Observatory for providing help during the observations. We would like to thank Drs. V. I. Slysh and I. E. Val'tts for helpful discussions, the anonymous referee for useful comments, Drs. M. Kutner and K. Mead for providing helpful information about the calibration at the 12-m Kitt-Peak antenna, Dr. D. Gabuzda for critically reading the manuscript, and V. Golubev for help during the preparation of this paper. The work was done under partial financial support of the Russian Foundation for Basic Research (grant No 95-02-05826), International Science Foundation (grants No MND000 and MND300), Royal Swedish Academy of Sciences, and European Southern Observatory. The Onsala Space Observatory is the Swedish National Facility for Radio Astronomy and is operated by Chalmers University of Technology, Göteborg, Sweden, with financial support from the Swedish Natural Science Research Council and the Swedish Board for Technical Development.

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998