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   71067
   Hughes, Hayashi, and Koyama (1998) made systematic spectral analysis of
   10 SNRs in the LMC and applied a evolutional model of SNR, named "Sedov
   model". This model reveals several features of SNR; metallicity becomes
   lower toward older one, approaching to the LMC mean metallicity, and an
   initial explosion energy is considarably diverse. But these features is
   slightly incomplete because these 10 samples are biased toward younger
   and brighter one. To supplement this defect, we propose observations of
   3 SNRs: 1E0532.6-7102 as older one, 1E0534-6947 and 1E0520.1-6929 as
   fainter ones. If these SNRs are added to Sedov model samples, we will
   be able to get more precise evolutional feature of SNR.
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