There was an error published in J. Exp. Biol. 210, 3677-3688.

In Eqn 1 on p. 3680, a ‘+’ sign was used instead of the correct ‘–’ sign. The equation is shown in its corrected form below.
(1)

The authors apologise for this error but assure readers that the correct equation was used in the calculations that form the results reported in the study.