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   61100
   We propose to observe RXJ1340.6+4018, which shows the extremely
   luminous and extended X-ray halo around the giant elliptical galaxy.
   This might be the key object for the study of evolution of galaxy and
   galaxy group through the merging origin of elliptical galaxy and low
   end of cluster formation. Observation will give us an evidence for the
   possible interpretation of fossil galaxy group.
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