Logo   Fitting Interface For Reciprocal Don Levin Sigmoid With Offset 2D
y = a1 / (1.0 + exp(-(x-b1)/c1)) + a2 / (1.0 + exp(-(x-b2)/c2)) + a3 / (1.0 + exp(-(x-b3)/c3))
y = 1.0 / y + Offset
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