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. 2019 Oct 8;10:4559. doi: 10.1038/s41467-019-12168-8

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© The Author(s) 2019

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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Fig. 1 — The layered structure revealed by tomography. a XRF tomography reconstruction slice across a lens (pixel size is 150 nm, red areas correspond to higher Ca content). Corresponding intensity line plot taken from the lens surface towards the center of the bulk (marked by a yellow arrow), shows the measured oscillations of the calcium signal (black) compared with theoretical schematic oscillations of the magnesium content (dashed red), perpendicular to the sample surface. b Typical nano-HT reconstructed dorsal arm plate (DAP) part, showing oscillations in mass-density (pixel size is 35 nm). Corresponding intensity line plot taken from the lens surface towards the center of the bulk (marked by a yellow arrow)