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   PR #    41
   A1689 at z=.178 at ~0.9mCrab is one of the most luminous clusters
   known with log ~8 kev. The IPC image is ~10in diameter. The Rosat
   observation was performed in July 1992 and belongs to W. Fe Fe
   abundance 2) measure the mass of the system 3) derive it mass
   distribution 4) constrain the evolution of Fe with redshift.
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