Ratio of the electron thermal conductivity for hydrogen enhanced according to B20 () to results, as a function of log ρ (dotted lines), for the labelled values of log T, with T given in Kelvin. Solid lines display the analogous ratio for the thermal conductivities obtained using the weakly damped enhancement factor F. Dot-dashed lines show the corresponding ratio for the strong damping, . The vertical lines mark the boundaries of the range of densities corresponding to θ = 1 and θ = 0.1 (higher ρ implies lower θ, at constant T).