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Astron. Astrophys. 338, 840-842 (1998) AcknowledgementsWe thank D. Dallacasa and I. Fejes for comments on the manuscript, and the referee, C. Fanti for useful suggestions. ZP and SF wish to acknowledge support for this research by the European Union under contract CHGECT920011, the Netherlands Organization for Scientific Research (NWO) and the Hungarian Space Office. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: September 17, 1998 ![]() |