{
 TFile* _file0 = TFile::Open("test.root");
 TH1D* ElecERatio = (TH1D*) _file0->Get("ScatElecEnergy");

 gInterpreter->Load("MyFitFunction.C");

 TF1 FitFunction("myFitFunction",MyFitFunction,10.,30.,7);
 FitFunction.SetParameters(1.9223668, -0.04884, 3.998807e+04, -6.356760e+03, 3.790429e+02, -1.004786e+01, 9.991058e-02);

 ElecERatio->SetYTitle("data/mc");
 ElecERatio->Fit(&myFitFunction);
 FitFunction.Draw("same");
	
}