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Astron. Astrophys. 362, 921-936 (2000) AcknowledgementsJ.L. Hou acknowledges the warm hospitality of the IAP(Paris, France). We are grateful to the referee, Dr. M. Peimbert, for his suggestions that improved the paper. This work was made possible thanks to the support of China Scholarship Council(CSC) and National Natural Sciences Foundation of China.
© European Southern Observatory (ESO) 2000 Online publication: October 30, 2000 ![]() |