... HH 223

Based on observations made with the 2.6 m Nordic Optical Telescope operated at the Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.

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... IRAF

IRAF is distributed by 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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... Catalogue

The USNOFS Image and Catalogue Archive is operated by the United States Naval Observatory, Flagstaff Station.

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