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Correction to: NPG Asia Materials advance online publication 7 July 2017; doi:10.1038/am.2017.97

After online publication of this article, the authors noticed a typographical error in the main text under the Methods section.

On the bottom right of Page 3, the original text ‘…, c12=93.46 × 1011 GPa …’ should read as ‘…, c12=93.46 GPa …’

The authors apologize for any inconvenience caused. The error has been corrected in the HTML and PDF versions of the article.