{
	
ROOT::Math::MinimizerOptions::SetDefaultMinimizer("GSLMultiFit");
	
TH1D * h1 = new TH1D("h1","h1",100,-5,5);
h1->FillRandom("gaus");


TGraphErrors *graph = new TGraphErrors(h1);

TGraph *fit_spline=	new TGraphErrors(h1);



Int_t n = graph->GetN();


for (Int_t i=0;i<n;i++){
	
	graph->SetPointError(i,0,graph->GetErrorY(i));
	
}



TF1 *fit= new TF1("fit",[&](double *x, double *par){return (par[0]*fit_spline->Eval(x[0]-par[2])+par[1]);},0 ,5, 3);   

fit->SetParameters(1,0.000000000000000001,0.00000000000000001);

fit->SetParLimits(2,0.000000000000000001,0.0000000000002);

graph->Draw("Ap");
graph->Fit("fit");

}