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   71167
   Since the X-ray emitting ICM comprise the major components of the
   visible matter of the clusters, to investigate evolution of X-ray
   properties of clusters is a key study of cosmology. Because there is a
   hint of evolution of clusters at the epoch of $z>0.6$, we propose ASCA
   observation of PDCS009, which is one of the most distant clusters at
   $z=1.20$.
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