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Astron. Astrophys. 359, 539-551 (2000) AcknowledgementsP. De Cat acknowledges the financial support of the Belgian Fund for Joint Basic Research, Project No. G.0398.98. We thank the referee, Dr. Petr Harmanec, for his very careful reading of our manuscript and for the numerous helpful comments that helped to improve the quality of the paper.
© European Southern Observatory (ESO) 2000 Online publication: July 7, 2000 ![]() |