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Astron. Astrophys. 322, 455-459 (1997) AcknowledgementsThis work was supported by the Nordic Optical Telescpe Scientific Association and the Swedish Natural Science Research Council (NFR). This research has made use of the La Palma archive. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 5, 1998 ![]() |