... surroundings

Based on observations made with several telescopes operated on the islands of La Palma and Tenerife by the Isaac Newton Group of Telescopes and Instituto de Astrofísica de Canarias in the Spanish Observatories of Roque de Los Muchachos and Teide of the Instituto de Astrofísica de Canarias.

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... IRAF

IRAF is distributed by NOAO which is operated by AURA Inc., under cooperative agreement with NSF.

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