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Astron. Astrophys. 347, 401-408 (1999) AcknowledgementsWe acknowledge the financial support from the Italian Ministry of University and Technological Development (MURST contract 40% 1996); EL acknowledges financial support from the Italian Space Agency (ASI contract RS-96.141). We would like to thank the referee, Dr. J.C. Raymond, for very useful comments on the original manuscript.
© European Southern Observatory (ESO) 1999 Online publication: June 18, 1999 ![]() |