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\item Another thing to consider: {\it does it even matter?} The time-scale they use in the paper is much larger than the sound-time, and places a more stringent test on the steady-state assumption. So my objection would only strengthen the conclusion.\\  The vorticity moves slowest, and the fluid velocity profile might only assume the anticipated form once this final contribution has had time to influence the entire profile.  \item {\it Could the problems in Payam's other paper conceivably be explained by this phenomenon? }     \item Some reading about propagation of hydrodynamic information:\\  \citet{Hinch_1975} application of Langevin equation to fluid suspensions; includes fluid inertia and interaction with suspension.\\  \citet{Ladd_1993} short-time motion of colloidal particles: theory.\\