Dimensionless diffusion coefficients as functions of Alfvénic Mach number in solenoidally driven single-fluid turbulence. The left and right panels show M_s ≃ 1 and M_s ≃ 10, respectively. Solid and dashed curves denote D_∥/(cL_box) and D_⊥/(cL_box) for r_L/L_box ≃ 8 × 10⁻³ and 8 × 10⁻². Increasing M_A reduces D_∥ and drives D_∥/D_⊥ toward unity.