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Fred,
I am no expert on what you are trying to do here but here goes.
If the function for the Sigmoid is similar to y=x/SQRT(a+x^2)
Where a is normally 1
Although I am guessing your graph has X and Y offsets in the formula.
eg Y-c = (x-b)/sqrt(1+(x-b)^2)
Where c = 1 to offset Y into positive territory and b = some value to shift X into positive territory - say 2
Substitute some other value for a, try lower value like 0.5 for more area under the curve.
Alternatively just change the values in the look up table manually
Graph it in excel to see how it looks or changes
Rally
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