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    PR # 31095                                                                   
     LMC SNRs are the best sample for the systematic study of SNRs. With t       
     he PV and AO1 observation, we have found X-ray spectral  changes betw       
     een Type Ia and II,  and/or ejecta-dominated and ISM-dominated SNRs.        
     In order to make it clear what causes this changes, other samples DEM       
     71, 0453-68.5, DEM299 are required. These SNRs also enable us to dete       
     rmine the LMC abundances and to solve the long-standing problem of io       
     n-electron   equilibrium below the shock-front.                             
                                                                                 
                                                                                 
                                                                                 
                                                                                 
                                                                                 
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