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Figure 9
Fourier spectra of the four-scale quasicrystals|: (a) for the octagonal quasicrystal, the radii of the circles from inside to outside are k8/3, 1, k4 and k8; (b) for the octadecagonal quasicrystal, the radii are k18/7, 1, k18/5 and k18.

IUCrJ
Volume 5| Part 3| May 2018| Pages 247-268
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518001161