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Astron. Astrophys. 343, L87-L90 (1999) AcknowledgementsWe warmly thank Dr. J. Crovisier for helpful discussion and for providing information on his ISO results prior to publication. This work has been supported under ASI, CNR and MURST contracts. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1999 Online publication: March 1, 1999 ![]() |