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Astron. Astrophys. 332, 1082-1086 (1998) AcknowledgementsWe are grateful to H. Coffey for providing us with the various data sets. This work was supported by the Swiss Nationalfonds under NF grant No. 21-40428.94. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: March 30, 1998 ![]() |