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. 2018 Jun 19;8:9351. doi: 10.1038/s41598-018-27637-1

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© The Author(s) 2018

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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Thermography of barrels used in the experiments. Photographs (taken by Gábor Horváth) and thermograms of the six sunlit barrels covered by different hides (black cattle, white cattle, grey horse, grey cattle, artificial zebra, real zebra) used in our experiments 3 and 4, and the change of surface temperature T (°C) along straight lines marked with arrows in the thermograms. The upper (red) and lower (green) arrow runs on a sunlit and shady region of the barrel shell, respectively. The beginning and the end (head) of the arrows correspond to the first and last data points of the T-curves, respectively. In the thermograms red, yellow, white, light blue and dark blue colour hues code hot, warm, medium, cool and cold temperatures, respectively. In E and F, the large T-differences between adjacent black and white stripes are visible both in the thermograms and the T-curves. The photographs were taken independently of the thermograms.