Red solid curves and orange shadings: Velocity anisotropy profile σ_r/σ_θ and 1σ confidence regions (estimated from 100 bootstrap resampling) for the four samples, obtained from the Jeans equation inversion using the minimum-BIC MAMPOSSt M(r) (see Table 2). The dashed red curves indicate the solutions obtained including galaxies in the central < 0.05 Mpc regions. For comparison, the grey shading reproduces the 1σ confidence regions of the MAMPOSSt solutions shown in Fig. 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.