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Astron. Astrophys. 337, 311-320 (1998) AcknowledgementsHB acknowledges the support of PPARC grant GR/K 94157 as well as a Royal Society travel grant. TM thanks Cardiff University of Wales for its hospitality. We also thank the referee, Max Ruffert for his fast response and his helpful suggestions. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: August 6, 1998 ![]() |