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Figure 7


Fig. 7. Radial averages of two-dimensional Fourier power spectra from TEM micrographs of structural colour producing butterfly scale nanostructures (Fig. 6). (A) Urania fulgens blue, (B) Parides sesostris, (C) Troides brookiana, (D) Troides urvillianus, (E) Mitoura gryneus. The shaded zone shows the range of spatial frequencies that are likely to produce coherent scattering of visible light wavelengths.





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