Inversion biases for vx at 1 Mm depth. Left: noiseless with cross-talk minimised versus the ideal . The departure from slope unity (grey dashed line) is due to an imperfect match between and . Right: noisy versus noiseless . The results are plotted in two cases: when the cross-talk is ignored (grey × ) and minimised (black + ). The linear fit to the black crosses coincides with the dashed line of slope unity. The black dotted lines represent the predicted error of 14 m s-1, which is consistent with the observed scatter of the black crosses.
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