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. 2019 Dec 18;475(2232):20190313. doi: 10.1098/rspa.2019.0313

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© 2019 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. — Lower and upper dispersion surfaces for the triangular lattice in figure 1, calculated for (a) $\tilde{α} = 0$ and (b) $\tilde{α} = 0.5$ . (Online version in colour.)