Fig. B.1
Estimates of power spectra of the signal (blue) and the noise (red) obtained from the real data as a function of angular degree l. The power spectrum of the signal (flows) was normalised so that the RMS of the flow is 100 m s-1. The power spectrum of the random noise was also normalised to RMS of 10 m s-1. Such a situation therefore represents S/N = 10.
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