...sources

Based on observations collected at Las Campanas Observatory, Carnegie Institution of Washington.

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...HREF="/articles/aas/full/1998/09/ds1435/footnode.html#180">^,

Figure 1 is can be accessed on the online version of the journal (http://www.edpsciences.com).

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...IRAF

IRAF is made available to the astronomical community by the National Optical Astronomy Observatories, which are operated by AURA, Inc., under contract with the U.S. National Science Foundation.

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...ARNICA

ARNICA can be obtained from the Osservatorio Astrofisico di Arcetri at ftp://150.217.20.1/pub/arnica/

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