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Astron. Astrophys. 334, 427-438 (1998) AcknowledgementsWe would like to thank Andrzej Marecki for very careful and critical reading of the manuscript. We thank Maria Rioja for the data correlation. We thank also Fredrik T Rantakyrö and Hardip Sanghera for important suggestions and help in calibrating of amplitudes of the EVN data. We are particularly grateful Dr Strom for valuable comments on the manuscript. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: May 15, 1998 ![]() |