- ... 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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