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Astron. Astrophys. 363, 537-554 (2000) AcknowledgementsWe would like to thank the staffs of the Isaac Newton Group of Telescopes, the Anglo-Australian Observatory, the South African Astronomical Observatory and both past and present members of the APS Division at The Queen's University of Belfast for their assistance in obtaining the observational data. Data reduction and analysis was performed on the PPARC funded N. Ireland STARLINK node. WRJR, RSIR and SJS acknowledge financial assistance from the PPARC.
© European Southern Observatory (ESO) 2000 Online publication: December 11, 2000 ![]() |