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Figure 9. A) Low frequency Fourier approximation of the detrended landscape yo(n) for the one-dimensional Ising model. All the frequencies f > Mr are removed. Fourier DFA computes the average square deviation of this approximation from the landscape. B) Linear DFA of the same landscape. Straight lines show least square linear fits obtained for different windows of size r = 512. Linear DFA computes the average square deviation of these fits from the landscape.

3. For r > 1, compute the average value of F^ n deternded fluctuation function as

FhirY

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