Published: 2003
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We have measured the spectral shape Michel parameters[rho] and[eta] using leptonic decays of the[tau], recorded by the CLEO II detector. Assuming e-[mu] universality, we find[rho][sub e[mu]]= 0.735[+-] 0.013[+-] 0.008 and[eta][sub e[mu]]= 0.015[+-] 0.061[+-] 0.062, where the first error is statistical and the second systematic.