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Astron. Astrophys. 319, 1007-1019 (1997) AcknowledgementsThis research was done while the authors were supported by the Lunar and Planetary Institute, which is operated by USRA under contract No. NASW-4574 with NASA. This is Lunar and Planetary Institute Contribution No. 897. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 ![]() |