#include <THStack.h>
#include <TSystem.h>
#include <TFile.h>
#include <TTree.h>
#include <TH1D.h>
#include <TCanvas.h>
#include <TLegend.h>
#include <TRandom.h>
#include <TROOT.h>
void carbonallregions(){
  THStack *stack = new THStack("hs","Stacked histograms");
TFile f("general.root");
 TH1F *h1 = (TH1F*) gDirectory->Get("C0000");
 
 h1->SetDirectory(0);
TFile f2("fragmentation.root");
 TH1F *h2 = (TH1F*) gDirectory->Get("C0000");

 h2->SetDirectory(0);
TFile f3("acceleratedregion.root");
 TH1F *h3 = (TH1F*) gDirectory->Get("C0000");
h3->SetDirectory(0);
 stack->Add(h1); stack->Add(h2); stack->(h3);
 stack->Draw();
 
}