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. 2016 Nov 3;5(1):1914. doi: 10.1186/s40064-016-3560-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. 2 — Population distribution observed at various stages of DE/best/1 and mDEOB/best/1. Note ‘FEs’ denotes the number of the function evaluations a DE: generation = 2, FEs = 60, b DE: generation = 4, FEs = 120, c DE: generation = 8, FEs = 240, d mDEOB: generation = 1, FEs = 60, e mDEOB: generation = 2, FEs = 120, f mDEOB: generation = 4, FEs = 240