Based on
observations obtained at the Canada-France-Hawaii Telescope
(CFHT) which is operated by the National Research Council of
Canada, the Institut des Sciences de l'Univers (INSU) of the
Centre National de la Recherche Scientifique and the University of
Hawaii, and at the Cerro Tololo Inter-American Observatory and
Mayall 4-meter Telescopes, divisions of the National Optical
Astronomy Observatories, which are operated by the Association of
Universities for Research in Astronomy, Inc. under cooperative
agreement with the National Science Foundation.
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