... Observatory¹ http://kanatatmp.g.hatena.ne.jp/kanataobslog/20090223/p1

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... IRAF.² IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation

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... archive³ http://casu.ast.cam.ac.uk

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...⁴ http://ned.ipac.caltech.edu

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