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Article History

Received: 8 January 2014

Accepted: 16 June 2014

First Online: 20 July 2014

Change Date: 20 August 2014

Change Type: Erratum

Change Details: In the version of this article initially published online, equation (2) in the Online Methods, which describes the expression used to calculate the distance between the location of a nucleus () and the plane defined by the vertices of a triangle on the convex hull (, and ) was incorrect. The operations between the positions of the nucleus and triangle vertices (, , and ) were incorrectly shown as a scalar product. The correct operation is a subtraction. The operations between the pairwise differences of the positions of the triangle vertices (, and ) were also incorrectly shown as a scalar product. The correct operation is a vector product. These errors have been corrected for the print, PDF and HTML versions of this article.

Competing interests

: The authors declare no competing financial interests.