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plot log1p((10^-10 - erfc(z/sqrt(2))/2) / (exp(-z^2/2)/sqrt(2*pi)) * z) / z, z = 6 .. 7
plot log1p((10^-10 - erfc(z/sqrt(2))/2) / (exp(-z^2/2)/sqrt(2*pi)) * z) / z, z = 6 .. 7
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