J. R. Soc. Interface 10, 20120617 (2012; Published online 3 October 2012) (doi:10.1098/rsif.2012.0617)
In equation (2.6), the two bottom lines feature an infinity sign (∞) instead of a proportional to sign (∝). The two bottom lines should appear as follows:
This does not affect the findings of the paper.