diff --git a/bind/G4Calo.py b/bind/G4Calo.py
index 96cd926..0c94120 100644
--- a/bind/G4Calo.py
+++ b/bind/G4Calo.py
@@ -12,9 +12,18 @@ class G4System(_G4System):
     def run_visualize(self,particleSpec : str, minEnergy_GeV: float, maxEnergy_GeV:float = -1.):
         if maxEnergy_GeV < 0:
             maxEnergy_GeV = minEnergy_GeV
+        #anpassen: run 1 event and get stuff from construction wrapper
         _G4System.run_visualize(self, particleSpec, minEnergy_GeV, maxEnergy_GeV)
         self.displayEvent()
 
+    def run_batch(self, nEvents: int, particleSpec : str, minEnergy_GeV: float, 
+                  maxEnergy_GeV:float = -1., outputFile:str = "dataframe.df"):
+        if maxEnergy_GeV < 0:
+            maxEnergy_GeV = minEnergy_GeV
+        _G4System.run_batch(self, nEvents, particleSpec, minEnergy_GeV, maxEnergy_GeV)
+        # here conversion from root to pandas dataframe
+
+
     def displayEvent(self):
         f_to_conv = max(filter(lambda x: x.endswith(".prim"), os.listdir()),
                     key=os.path.getctime)
diff --git a/bind/example.py b/bind/example.py
index dd93507..1d6c950 100644
--- a/bind/example.py
+++ b/bind/example.py
@@ -8,6 +8,6 @@ cw.addLayer(10,"G4_Si",True, 3) #10 cm of Silicon, active, 3x3 segmentation
 
 G4s = G4System()
 G4s.init(cw)
-#G4s.run_batch(100, "gamma", 1000, 5000) #100 events, photons, 1000 MeV to 5000 MeV
+G4s.run_batch(100, "gamma", 1, 5) #100 events, photons, 1000 MeV to 5000 MeV
 
-G4s.run_visualize("gamma", 1000, 5000) 
\ No newline at end of file
+G4s.run_visualize("gamma", 1, 5) 
\ No newline at end of file
diff --git a/include/DetectorConstruction.hh b/include/DetectorConstruction.hh
index bba9cdb..082aba8 100644
--- a/include/DetectorConstruction.hh
+++ b/include/DetectorConstruction.hh
@@ -61,6 +61,7 @@ class DetectorConstruction : public G4VUserDetectorConstruction
 {
   public:
 
+    //we have to pass around these global things...
     static DetectorConstruction* _global_detector_construction;
     static DetectorConstruction* getDetectorConstruction(){
         return _global_detector_construction;
@@ -75,7 +76,7 @@ class DetectorConstruction : public G4VUserDetectorConstruction
     G4VPhysicalVolume* Construct() override;
     void ConstructSDandField() override;
 
-   void setConstructionWrapper(ConstructionWrapper* Cw){
+    void setConstructionWrapper(ConstructionWrapper* Cw){
         this->cw = Cw;
     }