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Astron. Astrophys. 334, 646-658 (1998) AcknowledgementsWe thank the staff of the telescopes, especially L. Knee and L.-Å. Nyman (SEST), and the SMTO/HHT staff for their help in taking the observations. GD gratefully acknowledges fiancial support from the Particle Physics and Astronomy Research Council (PPARC) (UK), for the observing run at JCMT. RM was supported by a Heisenberg fellowship by the Deutsche Forschungsgemeinschaft. JM-P has been partially supported by the Spanish DGES under grant number PB96-0104. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: May 15, 1998 ![]() |