diff --git a/geant4/LEMuSR/src/lem4RootOutput.cc b/geant4/LEMuSR/src/lem4RootOutput.cc
index 45976fe..e96b256 100644
--- a/geant4/LEMuSR/src/lem4RootOutput.cc
+++ b/geant4/LEMuSR/src/lem4RootOutput.cc
@@ -233,6 +233,7 @@ void lem4RootOutput::FillEvent() {
   //  G4cout << "eventID="<<eventID_t<<";  Deposited E (el, pos, gam, mu)="<<det_edep_el<<", "
   //	 << det_edep_pos<<", "<< det_edep_gam<<", "<< det_edep_mup<<G4endl;
   //  G4cout<<"fieldValue="<<fieldValue_t<<G4endl;
+  //  G4cout<<"  muDecayPosX="<<muDecayPosX_t << "   muIniPosX="<<muIniPosX_t<<G4endl;
   rootTree->Fill();
   //  G4cout<<"Kamil: end of Filling the Root Tree:"<<G4endl;
 }
diff --git a/geant4/LEMuSR/src/lem4ScintSD.cc b/geant4/LEMuSR/src/lem4ScintSD.cc
index 0a8f695..99cd95c 100644
--- a/geant4/LEMuSR/src/lem4ScintSD.cc
+++ b/geant4/LEMuSR/src/lem4ScintSD.cc
@@ -49,8 +49,9 @@ lem4ScintSD::~lem4ScintSD(){ }
 void lem4ScintSD::Initialize(G4HCofThisEvent* HCE) {
   if (verboseLevel>1) G4cout<<"VERBOSE 2:  lem4ScintSD::Initialize\n";
   //  Positron_momentum_already_stored=0;
-  lem4RootOutput* myRootOutput = lem4RootOutput::GetRootInstance();
-  myRootOutput->ClearAllRootVariables();
+  // comment the following lines to disable output of initial variables
+  //lem4RootOutput* myRootOutput = lem4RootOutput::GetRootInstance();
+  //myRootOutput->ClearAllRootVariables();
 
   scintCollection = new lem4ScintHitsCollection
                           (SensitiveDetectorName,collectionName[0]);