Radial dependence of the DF force acting on a particle of mass m_t = 10⁻³M on a circular orbit at v_c (dashed lines), of the typical force fluctuation $\overline{\delta f}\approx {\alpha }^{2/3}$ (solid lines, increasingly light shades of red correspond to larger values of N), and radial dependence of the strength of the gravitational field, ||∇Φ|| (black heavy solid line). The left panel corresponds to the γ = 0 case and the right one to the γ = 1 case.