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. 2018 Dec 10;5:36. doi: 10.1186/s40658-018-0234-7

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© The Author(s). 2018

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 — Relationship between D₁, D₂, and D₃ + D₄ or D_3. Legend: Relationship between D₁, D₂ and a D₃ + D₄ and b D₃. The multilinear fits are shown (blue planes).