Simple analysis of kinematic distributions in tau lepton decays. This includes the mass distribution of the hadronic decay products of the $\tau$ in the 2, 3, 4 and 5 hadron decays. The two hadron modes included are $\tau^-\to\nu_\tau\{\pi^-\pi^0,K^-\pi^0,K^0\pi^-,K^-\eta,K^-K^0\}$. The three hadron modes included are $\tau^-\to\nu_\tau \pi^+\pi^-\pi^-$, $\tau^-\to\nu_\tau \pi^0\pi^0\pi^-$, $\tau^-\to\nu_\tau K^-K^+\pi^-$, $\tau^-\to\nu_\tau K^0\bar{K}^0\pi^-$, $\tau^-\to\nu_\tau K^-K^0\pi^0$, $\tau^-\to\nu_\tau \pi^0-\pi^0K^-$,$\tau^-\to\nu_\tau K^-\pi^-\pi^+$, $\tau^-\to\nu_\tau \pi^-K^0\pi^0$, $\tau^-\to\nu_\tau \pi^-\pi^0\eta$, $\tau^-\to\nu_\tau \pi^-\pi^0\gamma$. The mass distributions in the four and five pion decays are included. The leptonic modes are also included. Charge conjugate modes are combined. This is based on a number of old Herwig internal analyses.
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