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Astron. Astrophys. 364, 443-449 (2000) AcknowledgementsWe thank Drs. Thomas Boller, Max Camenzind, Stefan Wagner and Ari Laor for critically reading the manuscript and for valuable comments. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: January 29, 2001 ![]() |