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   61086
   We propose to observe an X-ray faint elliptical galaxy NGC3923 for 200
   ksec, in order to accurately quantify its radial X-ray brightness
   profile. If its radial profile can be expressed by a single beta model,
   we are convinced that X-ray faint galaxies differ in their potential
   structure from X-ray luminous ellipticals, which generally have larger-
   scale outer potential structure.
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