Scientific Reports 5: Article number: 13012; published online: 17 August 2015; updated: 29 October 2015

In the original version of this Article, Klaus Leifer was incorrectly listed as being affiliated with ‘Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden’. The correct affiliation is listed below:

Department of Engineering Sciences, Division of Applied Materials, Uppsala University, Uppsala, Sweden.

This error has now been corrected in both the HTML and PDF versions of the Article.