Radial profiles of Q (left columns) and Q_r (right columns) within the virial radius, and the 1σ confidence regions (shaded areas), for different types of member tracers: green for the ALL sample (top panels), red for the RED sample (middle panels), and blue for the BLUE sample. The shaded areas represent the propagation of the errors associated with ρ, σ and σ_r. The dashed lines are the power-law relations Q(r) ∝ r^-1.84 and Q_r(r) ∝ r^-1.92 found by Dehnen & McLaughlin (2005) on numerically simulated haloes. The vertical dotted lines locate the virial radius of the combined model (see Sect. 4).