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. 2017 Jan 31;10:26. doi: 10.1186/s13068-017-0711-6

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© The Author(s) 2017

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. 4 — Contour plots of the updated Kriging interpolation after the fourth round of experiments. The non-varied components were fixed at MgSO₄ = 1.7 × Ref, CaCl₂ = 0.82 × Ref, Trace = 1 × Ref, or NaNO₃ = 0.37 × Ref. Red dots indicate measurement data