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Astron. Astrophys. 323, 399-414 (1997) AcknowledgementsThis work was supported in part by the Netherlands Organization for Scientific Research (NWO) under grant PGS 78-277 and by the Netherlands Foundation for Research in Astronomy (ASTRON) under grant PGS 781-76-017. EK acknowledge receipts of an ESA fellowship.
© European Southern Observatory (ESO) 1997 Online publication: June 5, 1998 ![]() |