Dabiri, J. O. (2005). On the estimation of swimming and flying forces from wake measurements. J. Exp. Biol.208, 3519-3532.

An error appears in Eqn 4 (p. 3521), which is propagated throughout the remainder of the manuscript. The correct version of the equation is as follows:
$\mathbf{F}=\left(1+\frac{1}{\mathbf{C}_{\mathrm{AM}}}\right){\rho}\frac{{\partial}}{{\partial}t}{{\int}}{\phi}\mathbf{n}\mathrm{d}S_{\mathrm{v}},$
where the factor 1/CAM denotes the element-wise inverse of the added-mass tensor.

The conclusions of the manuscript are unaffected by the error; however, the quantitative interpretation of the wake vortex ratio (Wa) is revised accordingly.

The author apologises for any inconvenience this may cause the reader.