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. 2016 Dec 1;12:32. doi: 10.1186/s12993-016-0117-9

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Fourier analysis of the mean velocity data for the SHR/NCrl (a) and WKY/NHsd rats (b) displayed in Fig. 2. Power spectral density (ordinate) is shown as a function of frequency (abscissa), and illustrates the difference in the ratio of variance in the high frequency as compared to the low frequency end of the spectrum between the two strains