Nature Communications 5: Article number: 4864 10.1038/ncomms5864 (2014); Published: 10 September 2014; Updated: 17 November 2014.

There were errors associated with the order of the Supplementary Movies in the version of this Article originally published, which were introduced while the HTML was being prepared. The files of Supplementary Movies 1, 2, 3, 4, 5 and 6 were incorrectly exchanged with those of Supplementary Movies 6, 5, 4, 3, 1 and 2, respectively. These errors have now been corrected in the HTML version of the Article; the PDF was correct from the time of publication.