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Furthermore, we find a dichotomy for the decay rates of the swirl component $u_{\\theta}$, that is, either $O(\\frac{1}{r+1})\\leq |u_{\\theta}(r,z)|\\leq \\frac{C\\log(r+1)}{(r+1)^{1/2}}$ or $|u_{\\theta}(r,z)|\\leq \\frac{C r}{(\\rho+1)^3}$, where $\\rho=\\sqrt{r^2+z^2}$. 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