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. 2017 Oct 26;7:14161. doi: 10.1038/s41598-017-14036-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Proxy measure of search spread for zero-vector ants (0 m condition). The dependent measure was the mean absolute deviation of all digitised points along the x-axis, which is perpendicular to the feeder-to-nest direction. The measure is divided into the first 10 m of travel and the next 10 m of travel. The boxes show the median in the centre line, the interquartile ranges at their top and bottom, and the 95% confidence interval about the mean at their shoulders. The tails show values that are 1.5 times the distance from the median to each quartile. The + symbols show outlying values beyond the tails.