...24

At the time of writing, the spectrum may be found on the ESO Hale-Bopp Homepage at http://http. hq.eso.org/comet-hale-bopp/comet-hale-bopp-may15-ga.html

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...1997

At the time of writing, this information may be obtained from the Comet Hale-Bopp European Team Homepage at http://www.iac.es/comet/hbet.html

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...al.

At the time of writing, this information may be obtained from the Pic du Midi Hale-Bopp Homepage at http://www.bdl.fr/s2p/comete/halebopp/halebopp.html

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