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Astron. Astrophys. 356, 418-434 (2000) AcknowledgementsThis work is part of a project supported by the Swiss National Science Foundation (grant NSF 7IP050163). B.N. is also grateful to DAAD for financial support (Ref. 325) and AIP for hospitality. V.N.L. is grateful to INTAS support (97-1192). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: April 10, 2000 ![]() |