... NGC 6611[*]
Based on observations at the European Southern Observatory in programmes 171.0237 and 073.0234.
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...[*]
Tables 9, 10, 11 and 12 are only available in electronic form at http://www.edpsciences.org
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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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... Gray[*]
http://nedwww.ipac.caltech.edu/level5/Gray/Graycontents.html
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Copyright ESO 2005