This research was supported by NASA grant NAG5-4301 and NSF grant AST9619552 to AW. MK was supported by KBN grant 2.P03D.006.1. Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under cont (2005)

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by Luís S. Barbosa , José N. Oliveira A
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