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Fast Fourier Transformation (FFT) analysis sequence. (A) Original scanning electron microscopy (SEM) image after image processing. (B) FFT output image of the frequency information. (C) 90° rotation of FFT output image and elliptical selection. (D) Hotspot of FFT (analysis mode: radial sums; number of points: 200). Color images available online at www.liebertpub.com/tec
