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Funct. Anal. 264 (2013), 429--463] are here improved to: {0.1cm}\n  {enumerate} For real scalars: $K_{n}\\leq\\sqrt{2}(n-1)^{0.526322}$. For complex scalars: $K_{n}\\leq\\frac{2}{\\sqrt{\\pi}}(n-1)^{0.304975}$.{enumerate} {0.1cm} \\noindent We also obtain sharper estimates for higher values of $n$. For instance, \\[ K_{n}<1.30379(n-1) ^{0.526322}\\] for real scalars and $n>2^{8}$ and \\[ K_{n}<0.99137(n-1) ^{0.304975}\\] for complex scalars and $n > 2^{15}.$","authors_text":"D.M. Serrano-Rodriguez, D. Nunez-Alarcon, D. Pellegrino, J.B. 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