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Astron. Astrophys. 355, 176-180 (2000) AcknowledgementsWe thank N. Prantzos for comments on the galactic chemistry aspects of this work. This research has been supported in part by the HCM Programme of the European Union under contract ERBCHRXCT 930339. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 2000 Online publication: March 17, 2000 ![]() |