Fig. 22
Δ-variance spectrum 
of a filled circle of diameter 20 pix (full line) and derivative of the logarithmic Δ-variance spectrum g(l) of the filled circle (dotted line) for S/N = ∞. Vertical lines denote the measured prominent scale of the filled circle at lp = 21.9 pix and the critical scale lc = 10.3 pix, characterizing the peak of the gradient spectrum (Eq. (34)).
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