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I am trying to recreate the phonon dispersion plot of the paper below

http://ocw.mit.edu/courses/electric...applications-spring-2003/projects/ProjP21.pdf

The problem is I do not know what the Tau, L, and X on the x-axis really mean and how they correspond to the three components of the wave vector K. Any help would be appreciated. Thanks!

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# Phonon dispersion Points/Modes question

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