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The value 0.030 - 0.033 was obtained using Stein\u0027s formula by substituting the results of structural analysis for highly drawn and annealed samples. The extrapolated value 0.030 was also obtained by assuming the affine deformation. On the other hand, as the intrinsic birefringence value of the a-form crystal, -0.013 was also obtained by summation of bond polarizability using crystal structure data. 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The value 0.030 - 0.033 was obtained using Stein\u0027s formula by substituting the results of structural analysis for highly drawn and annealed samples. The extrapolated value 0.030 was also obtained by assuming the affine deformation. On the other hand, as the intrinsic birefringence value of the a-form crystal, -0.013 was also obtained by summation of bond polarizability using crystal structure data. 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