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Astron. Astrophys. 331, L21-L24 (1998) AcknowledgementsThis work was partially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Fundação do Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brazil. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: February 16, 1998 ![]() |