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Astron. Astrophys. 359, 1201-1204 (2000) AcknowledgementsThis research has made use of the US Naval Observatory (USNO) Radio Reference Frame Image Database (RRFID), of the Centre de Données Astronomiques de Strasbourg (CDS) and of NASA's Astrophysics Data System Abstract Service. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: July 13, 2000 ![]() |