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. 2017 Jan 21;18:52. doi: 10.1186/s12859-016-1452-4

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© The Author(s) 2017

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. 4 — Improvement as a function of cooperation. Percentage of improvement of a new best solution with respect to the previous best known solution, as a function of the number of cooperation events. Results obtained from benchmark B4, as reported in the Results and discussion section