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Astron. Astrophys. 357, 145-148 (2000) AcknowledgementsI thank Michele Maris and Gabriele Cremonese for the use of observing time in common. This work made use of SIMBAD and has been financed by italian MURST and ASI. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: May 3, 2000 ![]() |