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   52001
   The discovery of bright, variable X-ray emission from Comet Hyakutake
   has unexpectedly opened an entire new field of research for X-ray
   astronomy. While several models have been proposed, none provide a
   satisfactory explanation for the surprisingly bright emission. In an
   effort to understand this new phenomenon, we propose spectral
   observations with ASCA of comets P/Encke and C/Hale-Bopp as part of a
   larger coordinated campaign.
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