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(2*1000)^0.5/(2^0.5*Gamma[(1 + 1000)/2]*Hypergeometric1F1Regularized(-(1/2), 1000/2, -(1000/2)))
(2*1000)^0.5/(2^0.5*Gamma[(1 + 1000)/2]*Hypergeometric1F1Regularized(-(1/2), 1000/2, -(1000/2)))
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