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Astron. Astrophys. 320, 957-971 (1997) AcknowledgementsWe would like to thank the IRAM staff, and operators for their help during observations. This work has been partially supported by the Spanish CICYT under grant number PB93-0048 ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: June 30, 1998 ![]() |