MAMPOSSt estimates of the velocity anisotropy profile, σ_r/σ_θ, for the four samples. Black curve and grey shading: Minimum-BIC solution and 1σ confidence region estimated by the MCMC analysis. Green dashed curve and turquoise shading: Weighted average and dispersion of the MAMPOSSt results from all different combinations of M(r) and β(r) models, using the MAMPOSSt likelihoods as weights (see also Table 2). Top-left panel: systems with Δm₁₂ ≤ 0.5. Top-right panel: systems with 0.5 < Δm₁₂ ≤ 1.0. Bottom-left panel: systems with 1.0 < Δm₁₂ ≤ 1.5. Bottom-right panel: systems with Δm₁₂ > 1.5.