Can anyone clarify how to use the Curve from Data Table function to draw a curve?

Can anyone clarify how to use the Curve from Data Table function to draw a curve? All of the examples I have found use it draw a straight line. I need to have the curve be dynamic (change based on the data in the bar chart) so I can't use the gausssian curve fit. I might be able to figure it out but it is not clear what arguments Tibco is looking for; an average and a standard deviation and it will extrapolate or every possible point along the curve. 

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