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. 2019 Feb 15;9:2155. doi: 10.1038/s41598-019-39411-y

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Active vibrational modes with displacement vectors for EPI in the 0–600 cm⁻¹ region (a) 281 cm⁻¹, (b) 287 cm⁻¹, (c) 292 cm⁻¹, (d) 302 cm⁻¹, (e) 347 cm⁻¹, (f) 353 cm⁻¹, (g) 368 cm⁻¹, (h) 422 cm⁻¹, (i) 453 cm⁻¹, (j) 468 cm⁻¹, (k) 489 cm⁻¹ and (l) 552 cm⁻¹. Arrows represent magnitude and direction of the displacements.