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. 2017 May 2;7:1373. doi: 10.1038/s41598-017-01496-8

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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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(a) The experimental spectra collected from a 10 μm spot (solid lines) compared to the spectral response as predicted by the transfer-matrix simulations (dashed lines). (b–d) The real part and imaginary part of the refractive index as a function of the cuticle’s depth at different stages of development of the cuticle, see legend.