The cut through the x = y = 0 point of the averaging kernel (solid) and the respective target function (dashed) for the v_x (left) and v_z (right) inversions using averaging over many flow realisations plotted along with the corresponding target functions at three discussed depths (1 Mm in blue, 3.5 Mm in green, and 5.5 Mm in red). Compare to Figs. 4 and 9 where the resemblance of the target functions is worse. The random error of the results is given in Table 2.