Distribution of path length S of magnetic field lines computationally traced to r = 0.35 AU ina model of solar wind turbulence (a representation of 2D MHD + slab magnetic turbulence in spherical geometry), superposed on a radial mean field of strength B₀ ∝ r⁻². The rms turbulent amplitude was set equal to the mean field, and the slab energy fraction to 0.2. The vertical dashed line indicates the mean value ⟨S⟩ = 0.447 AU, which is close to our theoretical result of 0.445 AU.