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Astron. Astrophys. 339, 811-821 (1998) AcknowledgementsWBL thanks the U.S. National Radio Astronomy Observatory for support during the initial phases of this work. JHB acknowledges support from the U.S. National Science Foundation through grant AST 96-18523. HO acknowledges financial support from the Swedish Natural Science Research Council. We thank Ms. Shanna Shaked for assistance with the figures. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: October 22, 1998 ![]() |