Fig. 1.

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Comparative performance of the methods M1, M2, M3, and M4, providing the fluctuation spectra of area Σ350 for AR 12524 in the entire frequency range. The particular case of threshold of th = 350 G is shown as an example. Here, the blue solid line indicates the model line with slope m that is computed by least square fitting (Eq. (1)) to the obtained power spectrum and the 95% confidence border is represented by the blue dashed line.
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