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Astron. Astrophys. 356, 1119-1135 (2000) AcknowledgementsThis project is supported by the Swedish National Space Board and the Swedish Natural Science Research Council. We thank the referee, Dr. Andrew Gould (Ohio State University), for stimulating criticism and constructive suggestions. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: April 17, 2000 ![]() |