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Power spectral densities (a) and the structure functions (b) for several models discussed in the text. The spectral indices are chosen to be: p = p1 = 1.3 and . The one-, two-, and three-dimensional spectra are normalized such that . The different power-law models show similar behavior at the outer scale frequency, , but deviate at the spectral break, , and the inner scale, , spatial frequencies. The correlation radius in the Gaussian spectrum is .
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