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Astron. Astrophys. 351, 1075-1086 (1999) AcknowledgementsI thank Guido Münch and Antonio Mampaso for their advice during the development of this project and their very helpful comments and suggestions, which have improved this manuscript. I also thank Terry Mahoney for revising the English text. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: November 16, 1999 ![]() |