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[blitz143]

Hi There, I'm a student and I'm currently determining the residence time distribution curve E-curve for step input tracer. I have the Cstep vs time curve, I know F-curve is basically (Cstep/Cinput) vs time. How do I get the  E-curve from the F-curve?

I know E(t) = dF(t)/dt but I don't know any software which will do the differentiation for me. 

 

 

Any help would be appreciated.