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The spin dynamics of Dy$_2$Ti$_2$O$_7$ is well described by using two relaxation times ($\\tau_{\\rm S}$ (short time) and $\\tau_{\\rm L}$ (long time)). Both $\\tau_{\\rm S}$ and $\\tau_{\\rm L}$ increase on cooling. Assuming the Arrhenius law in the temperature range 0.5-1 K, we obtained an energy barrier of 9 K. 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