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The (upper, lower) fast Khintchine spectrum for $\\psi$ is defined as the Hausdorff dimension of the set of numbers $x\\in (0,1)$ for which the (upper, lower) limit of $\\frac{1}{\\psi(n)}\\sum\\_{j=1}^n\\log a\\_j(x)$ is equal to $1$. The fast Khintchine spectrum was determined by Fan, Liao, Wang, and Wu. We calculate the upper and lower fast Khintchine spectra. 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Let $\\psi : \\mathbb{N} \\rightarrow \\mathbb{N}$ be a function with $\\psi(n)/n\\to \\infty$ as $n\\to\\infty$. The (upper, lower) fast Khintchine spectrum for $\\psi$ is defined as the Hausdorff dimension of the set of numbers $x\\in (0,1)$ for which the (upper, lower) limit of $\\frac{1}{\\psi(n)}\\sum\\_{j=1}^n\\log a\\_j(x)$ is equal to $1$. The fast Khintchine spectrum was determined by Fan, Liao, Wang, and Wu. We calculate the upper and lower fast Khintchine spectra. 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