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Figure 7
(a) and (b) show two-dimensional power spectral densities of the phase reconstructions of data sets 2 and 3 (cf. Figs. 5[link]d and 6[link]c), respectively. The frequency contributions from the rod shape of the nanowire lie within a frequency ring that corresponds to [{\rm d}x = 1/2\nu = 125] nm half-period resolution. In the power spectrum of data set 3 (b) frequency contributions appear also in the frequency shell corresponding to dx = 38–125 nm (cf. white arrow). (c) presents PRTF calculations of the three data sets: 1 (red), 2 (green), 3 (blue). The drop of the PRTF below 0.5 (horizontal solid black line) is indicated by a vertical dash–dotted black line at dx = 83 nm half-period resolution.

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ISSN: 2053-2733
Volume 70| Part 6| September 2014| Pages 552-562
doi:10.1107/S2053273314014545
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