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   51229
   The line emission in the X-ray spectrum of clusters of galaxies are
   useful tool to study physical condition of plasma. For distant
   clusters, Fe-K lines are shifted below 7keV and observed with better
   efficiency. For A665, from detailed line analysis, it was found that
   the ratio of K alpha to K beta seemed to be smaller than the model
   prediction. The metal abundance derived from Fe-K beta is 3 times
   larger than that derived from K alpha. This anomaly seems to be seen in
   the outer region of cluster, though it is marginal because of
   statistical error. This phenomena has been seen in the some clusters.
   We propose the re-observation of A665 and make sense of anomaly with
   good statistics. This lead the test of the collisional ionization
   equilibrium assumption of ICM.
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