... PG 1605+072

Based on observations at the Bok Telescope on Kitt Peak, operated by Steward Observatory (University of Arizona).

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...

Based on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway, and Sweden, in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

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...

Based on observations collected at the European Southern Observatory, Chile.

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