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. 2018 Oct 31;474(2218):20180075. doi: 10.1098/rspa.2018.0075

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© 2018 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Examples of vibration modes plotted over the first Brillouin zone (frequency ν_i versus Brillouin radius σ_a). Note for each vibration mode the curves overlap except for v₃, where the difference is small. (Online version in colour.)