Functions incorporated to store data from a txt file to a tree and read the tree

Time walk correction/MyTree.C

-void MyTree(){
+void ReadEnergy(){
 
   std::ifstream Energy_file("Energy_table.dat");
   double Ecol1,Ecol2,Ecol3,Ecol4;
@@ -21,3 +21,26 @@ void MyTree(){
   Efile->Write();
 
 }
+
+void ReadTPdata(){
+
+  TFile* readEfile = new TFile("Energy_table.root", "read");
+  TTree* tree = (TTree*)readEfile->Get("ETree");
+
+  double energy, voltage;
+
+  tree->SetBranchAddress("Ecol1",&energy);
+  tree->SetBranchAddress("Ecol4",&voltage);
+
+  for(int i= 0; i < tree->GetEntries(); i++){
+
+    tree->GetEntry(i);
+    cout << energy << " " << voltage << std::endl;
+  }
+}
+
+void MyTree(){
+
+  ReadEnergy();
+  ReadTPdata();
+}