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. 2016 May 20;5(1):668. doi: 10.1186/s40064-016-2252-z

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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.

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Fig. 4 — HoloTC feedback control. Derived from Seetharam and Yammani (2003, Figure 1), Andrès et al. (2004, Figure 1) and Loikas (2007, Figure 2.4)