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. 2016 Apr 26;17:183. doi: 10.1186/s12859-016-1030-9

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© Li et al. 2016

Open Access This 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. 7 — Derivatives of the time features (corresponding to the example given in Fig. 6) (a) F1′, (b) F2′, (c) F3′ and (d) their product over time. The right panels are zooms in the peak region. A first clear peak of the feature derivatives product can be observed at the frame of interest. Scalebar is 20 μ m