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This paper is based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA contract NAS5-26555. We thank the director of the Space Telescope Science Institute for granting us HST Director Discretionary time. G.B. acknowledges the support of NSF through grant AST96-18439. E.L.M. was supported by a post-doctoral fellowship of the Spanish Ministerio de Educación y Cultura.
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