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   52187
   We propose to use ASCA to determine the mass profiles of a well-
   selected sample of clusters at median redshift z = 0.08. The targets
   are chosen to allow determination of the mass profile to as large a
   radius as possible, while minimizing systematic effects and maximizing
   the signal-to-noise level. Systematics are minimzed by selecting
   objects with temperatures between 3-5 keV and smooth, round X-ray
   isophotes. Detectability is ensured by selecting objects based on their
   ROSAT X-ray fluxes. The signal-to-noise level should allow us to
   measure the binding mass out to the virial radius and the Fe abundance
   out to 1 Mpc.
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