f(x) = 1 / (1 + e^(-10*(x/15 - 0.5))) + z, x in [0, 20], z in[-0.1,0.1]f(x) = 1 / (1 + e^(-10*(x/15 - 0.5))) + z, x in [0, 20], z in[-0.1,0.1]

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