Double_t myfunction10(Double_t *x, Double_t *par)
{
   Float_t  xx=x[0];
   Double_t fbckgnd=splineBkgd10->Eval(xx); //cos(xx);
   Double_t fpeak=splinePeak10->Eval(xx);
   Double_t f=(par[0]*fpeak)+(par[1]*fbckgnd);
   return f;
}
void myfuncTest10()
{
   // set the coefficients and plot the spline to check.
   TF1 *f1 = new TF1("myfuncTest10",myfunction10,0.45, 2.5, 2);
   f1->SetParameters(1,2);
   f1->SetParNames("peak","background");
   f1->Draw();
}
void myfit10(TH1 *histname)
{
  // Now use the spline curve to fit the histogram in the argument.
  TF1 *f1 = (TF1 *)gROOT->GetFunction("myfuncTest10");
  f1->SetParameters(1,1);
  histname->Fit("myfuncTest10");
  Double_t par0  = f1->GetParameter(0);
  Double_t dpar0 = f1->GetParError(0);
  Double_t par1  = f1->GetParameter(1);
  Double_t dpar1 = f1->GetParError(1);
  cout << endl;
  cout << "For myfit10 par0= " << par0 << " +/- " << dpar0 << "; par1= " << par1 << " +/- " << dpar1 << endl << endl;
}