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. Author manuscript; available in PMC: 2014 Feb 1.
Published in final edited form as: Cell Microbiol. 2012 Nov 6;15(2):213–226. doi: 10.1111/cmi.12041

Figure 2. 2D Fourier transform provides evidence for differences in helical packing.

Figure 2

(A) 2D class averages representing the line-pattern and (B) the column pattern, and their corresponding sum of the amplitude spectra of all class members (120 and 242 members in A and B, respectively). The heights of the first layer line and the measured Bessel order (n) are indicated.