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Astron. Astrophys. 339, 872-879 (1998) AcknowledgementsWe are grateful to A. Sievers and A. Greve for carrying out the IRAM-30m observations. We are also grateful to R.L. Snell for helpful advices, to R. Cesaroni for critically reading the manuscript, and to an anonymous referee for useful comments. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: October 22, 1998 ![]() |