0.8375*(1+erf(4*x/(2^(1/2))))*(e^(-x^2*8))*(2*(2/pi)^1/2)+.1125*(e^(-(x-0.8)^2*72))*(6*(2/pi)^1/2)+.05*(e^(-(x+0.8)^2*72))*(6*(2/pi)^1/2)

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