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. 2016 Jul 26;6:28836. doi: 10.1038/srep28836

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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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Illustration of eggshell ultrastructure traits (A,B) and the correlation matrix plots among them (C). EST, ET, MT and MD represent eggshell thickness, effective layer thickness, mammillary layer thickness and mammillary density, respectively. On the diagonal are the univariate distributions, plotted as histograms and kernel density plots (C). On the right of the diagonal are the phenotypic pair-wise correlations, with red stars indicating significance levels (***p ≤ 0.001, **0.001 < p ≤ 0.01, *0.01 < p ≤ 0.05). On the left side of the diagonal is the scatter-plot matrix, with LOESS smoothers in red to illustrate the underlying relationship.