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Astron. Astrophys. 321, 409-423 (1997) AcknowledgementsWe acknowledge helpful discussions with Dr. J. Sulentic. This work was partially supported by DGICYT Spanish Grant PB93-0159 and by Junta de Andalucía (Spain). ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 30, 1998 ![]() |