void tfit(const char *amin, const char *amax)
{
   gROOT->LoadMacro("./t.C");
   gROOT->LoadMacro("./autocorr.C");
   t();
   gProof->AddInputData(new TNamed("amin",amin));
   gProof->AddInputData(new TNamed("amax",amax));
   showcut12(12,12);
   TH1F *f4 = draw("trist");
   TH1F *f4folded = foldit(f4);
   f4folded->Draw();
   TF1 *ff = fitf();
   ff->SetLineColor(2);
   ff->SetParameters(2.1,25,0.5,0.01);
   f4folded->Fit(ff);
}