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   71184
   There are mainly two methods to determine the total mass of clusters of
   galaxies. One is the method to use the configurations of arcs by
   optical observations. The other is the method to use the X-Ray
   observations. However, many clusters show a mass discrepancy between
   total masses deduced from these methods. We are interested in the
   cluster of galaxies Abell s295. There is no mass discrepancy in Abell
   s295 (Wu & Fang 1998). However, Wu & Fang estimated the X-Ray
   temperature from Lx-kT relation.If X-ray spectrum is available ,we can
   determine the temperature of the ICM observationally. Our final goal is
   to try to find the cause of the mass discrepancy.
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