Top panels: comparison of the velocity dispersions of the original super profiles to those derived from SP profiles using |Δ _{H − I} | ⩽ 5 km s ⁻¹. Bottom panel: comparison of the velocity dispersions derived from SP profiles using the |Δ _{H − I} | ⩽ 5 km s ⁻¹ with those derived from SP profiles using |Δ _{H − I} | ⩽ 2 km s ⁻¹. Dashed lines are lines of equality. Symbols are as in Figure 8.