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Astron. Astrophys. 337, 9-16 (1998) AcknowledgementsWe thank the referee, Roelof Bottema, for his comments that have significantly improved the paper. VR acknowledges support from Russian State Committee of Higher Education, Russian Foundation for Basic Research (98-02-18178) and from French Ministère de la Recherche et de la Technologie. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 6, 1998 ![]() |