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Astron. Astrophys. 326, 257-262 (1997) AcknowledgementsSupport by FAPEMIG, CNPq, FINEP, CAPES (Brazilian institutions). Fruitful discussions with Dr. Å. Nordlund and Dr. J.V. Clausen are gratefully acknowledged. The comments of an anonymous referee were fundamental to bring this work to its final form. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: April 20, 1998 ![]() |