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. 2016 Feb 8;6:20572. doi: 10.1038/srep20572

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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NanoSIMS ratio images of Mg/Ca (left) and Sr/Ca (right) of natural growth in the summer (a,b) and winter (c,d). The field of view is 20 × 20 um. Note the pronounced banding in both Mg and Sr in the summer samples (top) versus the lower concentrations and less pronounced banding in the winter sample (bottom). The colour scheme represents the ratio of Mg and Sr to Ca, respectively. Blue represents a ratio of 0.0001 Mg/Ca and magenta a ratio of 0.1 for Mg, and 0.0001 and 0.0085 for Sr.