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We derive new spectral estimates for these quantities and compute explicit matrices that achieve our bounds. We recover the well-known fact that the supremum of $CN(T)$ over all matrices with $||T||_{} \\leq1$ and minimal absolute eigenvalue $r=\\min_{i=1,...,n}|\\lambda_{i}|>0$ is the Kronecker bound $\\frac{1}{r^{n}}$. 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