Fitting with multifunction

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Please can anyone help me in merging all the 3 functions together for fitting it…
As I can see that my function are fitting individually but now I have to make them 1 function which fitts the TGraph and further I can find its mean value…FitSKAN.C (3.1 KB)
TGRAPH.root (49.3 KB)

@couet, perhaps you can help here please?

Thank you so much,
Oksana.

I think this fitting question is more for @moneta

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