diff --git a/Analysis/plotHisto.cc b/Analysis/plotHisto.cc
index 8c55a64269ec29d95505967bf7e65fd594544a7c..8551f92f1d769b9e28514b38172b2a0ec558599c 100644
--- a/Analysis/plotHisto.cc
+++ b/Analysis/plotHisto.cc
@@ -21,9 +21,9 @@ int main(int argc, char *argv[]){
   if(name.find(".") != string::npos) name.erase( name.find_last_of(".") );
 
   TTree *t = (TTree*)f->Get("lightGuide");
-  double x,y;
+  double x,z;
   t->SetBranchAddress("X",&x);
-  t->SetBranchAddress("Y",&y);
+  t->SetBranchAddress("Z",&z);
 
   TCanvas *c = new TCanvas("Data","Data",1280,720);
   TH2D *h = new TH2D("eff","Relative Efficiency",40,-82,82,40,-42.875,42.875);
@@ -31,7 +31,7 @@ int main(int argc, char *argv[]){
   int nEvents = t->GetEntries();
   for(int ev = 0; ev < nEvents; ev++){
     t->GetEntry(ev);
-    h->Fill(y,x);
+    h->Fill(z,x);
   }
 
   gStyle->SetOptStat(0);
diff --git a/src/EventAction.cc b/src/EventAction.cc
index ce70ba7cc6b0481bd15991f6675bf380e72afe5a..025ab3bfd982412b1aac51bbf0a6bcb577457f36 100644
--- a/src/EventAction.cc
+++ b/src/EventAction.cc
@@ -75,9 +75,9 @@ void EventAction::EndOfEventAction(const G4Event* event){
       // fill ntuple  //
       G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
       analysisManager->FillNtupleDColumn(0, aHit->getPos().x() );
-      analysisManager->FillNtupleDColumn(1, aHit->getPos().y() );
+      analysisManager->FillNtupleDColumn(1, aHit->getPos().z() );
       analysisManager->FillNtupleDColumn(2, aHit->getHit().x() );
-      analysisManager->FillNtupleDColumn(3, aHit->getHit().y() );
+      analysisManager->FillNtupleDColumn(3, aHit->getHit().z() );
       analysisManager->FillNtupleDColumn(4, aHit->getTime()  );
       analysisManager->AddNtupleRow();
     }
diff --git a/src/RunAction.cc b/src/RunAction.cc
index a348a7494d3526d14dd1d1a5c6e6eebf2b6b55e7..4c0375132d8ce01bdc42255322a578f42b74a27f 100644
--- a/src/RunAction.cc
+++ b/src/RunAction.cc
@@ -63,9 +63,9 @@ RunAction::RunAction(G4String fileName)
   // Creating ntuple
   analysisManager->CreateNtuple("lightGuide", "pos and momentum");
   analysisManager->CreateNtupleDColumn("X");
-  analysisManager->CreateNtupleDColumn("Y");
+  analysisManager->CreateNtupleDColumn("Z");
   analysisManager->CreateNtupleDColumn("hitX");
-  analysisManager->CreateNtupleDColumn("hitY");
+  analysisManager->CreateNtupleDColumn("hitZ");
   analysisManager->CreateNtupleDColumn("time");
   analysisManager->FinishNtuple();
 }