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Astron. Astrophys. 357, 1045-1050 (2000) AcknowledgementsThis research has been supported by the Assemblea Regionale Siciliana (ARS), the Ministero dell'Università e della Ricerca Scientifica e Tecnologica (MURST), and the Italian Consiglio Nazionale delle Ricerche (CNR). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: June 5, 2000 ![]() |