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Astron. Astrophys. 333, 13-16 (1998) AcknowledgementsJ.F.G. received collaborative travel support from the University of Manchester Dept. of Astronomy and computer support at NRAL, Jodrell Bank during the completion of this work. C.G.M. acknowledges receipt of a PPARC Research Fellowship. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: April 15, 1998 ![]() |