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Table 1: Growth rate k, with an estimate of the related uncertainty $\Delta k$ , for the radial orbit instability from the simulation of a set of $f^{(\nu )}$ models. Here $\kappa = 2K_{\rm r}/K_{\rm T}$ is the global anisotropy parameter and $\eta = a_3/a_1$ is the axis ratio of the inertia ellipsoid referred to the sphere of radius 3 r_M. For $M = 10^{11}~M_{\odot}$ and $r_M = 5~\rm kpc$ , k is given in units of $10^{-8}~\rm yr^{-1}$ .