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Figure 6
Mean-square amplitudes of librational motion in the inertial frame plotted against T. For clarity, the L21 and L22 curves have been shifted up the vertical axis by 20 and 10 units, respectively, and the ordinate scales must be adjusted accordingly. The curves have the form `a coth (b/T)', where the `a's have been found from coth (b/­T) → 1 as T → 0 and the `b's from coth (b/T) → T/b for small b/T.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 55| Part 5| October 1999| Pages 767-787
doi:10.1107/S0108768199004279
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