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Astron. Astrophys. 357, 1073-1085 (2000) AcknowledgementsThis work was supported by the FWO-Vlaanderen grant G.0335.98 and by Intas grant 96-530. Yu.V. acknowledges the financial support by the KUL and by Ukrainian FFR grant 2.4/1003. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: June 5, 2000 ![]() |