Radial distributions of velocity anisotropy parameter β for the ten undisturbed clusters. Lightly shaded regions show the 1σ confidence intervals. The mean values of β are consistent with an isotropic velocity distribution within the errors at small radii, while at large radii the velocity anisotropies are clearly presented in spite of the large errors. The two big error bars at small and large radii represent the allowed ranges set by the priors on β₀ and β_∞, respectively. The lower boundary is −0.5 at all radii.