Compensated velocity (top) and log density (bottom) power spectra for runs A0 and B0. Solid lines correspond to run A0 and dashed lines to run B0. The vertical dotted lines show the ambipolar diffusion scale, k_AD, calculated for the mean density in the simulation, n₀ = 500 cm^-3, the resolution scale, k_m, and the sonic scale, k_s. The spectra are shown for a simulation time t = 10^-2, which is 0.62 Myr in physical units. The turbulence crossing time is roughly 0.4 Myr.