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Figure 9
(Top) Image of the FPS of the diatom subregion. The full-period spatial frequency at the left edge of the image is 48 nm−1. To avoid artefacts from the sharp edges of the real-space image (as shown in the subpanel of Fig. 8[link]) the FPS was filtered with a Gaussian window function with a standard deviation of 2.4 µm. Before display, the FPS was raised to the power 0.1, in order to reveal the Thon rings underneath the much stronger peaks from the hexagonal lattice. (Bottom) Azimuthal average of the FPS, with a cut-off frequency corresponding to a full-period resolution of 45 nm (half-period resolution of 22.5 nm, 5% smaller than the de-magnified pixel size).

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 53| Part 4| August 2020| Pages 927-936
https://doi.org/10.1107/S1600576720006925
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