PDSs of the three magnetic field components, B_ϖ, B_φ, and B_z, averaged over 50 frames of the BHz simulation. The vertical error bars show the rms variation within the bin and between the frames. Solid red lines show the best fits with the empirical Equation (22). The dotted blue lines show Kazantsev’s power-law scaling ∝k^3/2 with identical (arbitrary) normalization.