{
if(gROOT->GetListOfFunctions()->FindObject("g"))
{
  TF1 *tmp = (TF1*)gROOT->GetListOfFunctions()->FindObject("g");
  tmp->Delete();
}
TF1 *g = new TF1("g","gaus");
g->SetParameter(0,10);
g->SetParameter(1,5);
g->SetParameter(2,1);
g->SetRange(0,10);
if(gROOT->GetList()->FindObject("fhTest"))
  (gROOT->GetList()->FindObject("fhTest")->Delete();
TH1F *fhTest = new TH1F("fhTest","fhTest",256,0,10);
fhTest->FillRandom("g",2000);
fhTest->Fit(g,"RN");
g->SetParameter(1,4.5);
//Here scan the, in this, chi2 between fhTest and g as a function of parameter
//one. In this example this is of course a somewhat stupid exercise...
}