Ratio of ohmic to collisional heating Q_rc/Q. The solid line shows the results for collisional scattering, and the other lines show the results for turbulent scattering, with a turbulent scattering length λ_T equal to 0.1× (red), 0.2× (green), and 0.3× (blue) the collisional mean free path of 7 × 10⁷ cm. The ratio is ≪1 at all positions in the target in all cases.