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. 2017 Jul 26;7:6631. doi: 10.1038/s41598-017-06884-8

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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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Effects of UVB irradiation. Absorbance (left column) and transmission (right column) plotted against wavelength, λ, for films with a surface density of 0.0031 mg/mm² (top row), 0.0124 mg/mm² (middle row) and 0.031 mg/mm² (bottom row). Each of the panels (a–f) display the average (n = 3 individual films for each dosage) absorbance or transmission spectrum prior to UVB irradiation (Control: red circle) and after UVB dosages of 80 J/cm² (green triangle), 160 J/cm² (black inverted triangle) and 320 J/cm² (blue square). Standard deviations in all cases are smaller than the symbol size and have not been plotted to improve visual clarity.