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Fig. 4.


Inverse of the S/N (top) and its effect on the noise reduction (middle) as well as the estimate of the spectrum of horizontal flows (bottom, as a velocity amplitude per mode) for different approaches. The S/N is clearly scale dependent, in contradiction to assumption (A1). We use  = k R to convert from wave number into harmonic degree. We do not show results for  = 0 because this corresponds to an arbitrary change in reference frame.

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