The azimuthally-averaged power spectra of the v_z inversion components at depths of 1, 3.5 and 5.5 Mm for averaging over many flow representations. For reference, we plot the power spectrum of using the black solid line. Then we plot the power spectrum of (solid line) and power spectrum of the noise (i.e., the power spectrum of ; dashed line) for the inversion where the cross-talk is minimised (blue) and ignored (red). Compare to Fig. 14.