In equation (5.10), the factor of 1/2 in the first term on the right hand side should be inside the bracket multiplying only the G(t) term.
In equation (3.5), the term $v_x$ should be premultiplied by a scale factor to reflect the change of the derivative from d/dx to d/dl (partial d's).
The same comment applies in the appropriate places throughout the paper. For example, for a two-dimensional interface in section 4, in equations (4.2) and (4.3)
$v_x$ should be replaced with $\sqrt{1+f_x^2}v_x$. On making this change, it is informative to note that (4.3) reduces to equation (2.4) of Halpern & Frenkel
(Journal of Fluid Mechanics, V. 485, 2003).
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