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of the following growth assumptions \\begin{align} & |V(z,t)| \\leq \\frac{f(\\rho(z,t))}{\\rho(z,t)^2},\\ \\text{where $f$ satisfies the Dini integrability condition as in (1.3)} \\\\ & \\text{or when } \\notag \\\\ & |V(z,t)| \\leq C\\frac{\\psi(z,t)^{\\epsilon}}{\\rho(z,t)^2},\\ \\text{for some $\\epsilon>0$ with $\\psi$ as in (2.6) and $N$ even.} \\notag 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