diff --git a/RMA2SERAPHIN_3DRMA11.py b/RMA2SERAPHIN_3DRMA11.py
index 09f1eb5..75ea769 100644
--- a/RMA2SERAPHIN_3DRMA11.py
+++ b/RMA2SERAPHIN_3DRMA11.py
@@ -311,8 +311,15 @@ def writePCTL(c,pctl):
     f.write(struct.pack(">l",len(NodeList)*4))
 
     columnName = [node2nodevalue[key] if key in node2nodevalue.keys() else key for key, value in nodeDict.items()]
+    
     global dfAll
-    dfAll = pd.DataFrame(columns=columnName)
+    dfAll = {}
+    
+    for key, value in nodeDict.items():
+        if key in node2nodevalue.keys():
+            key = node2nodevalue[key]
+            
+        dfAll[key] = np.array([])
     
     cpt = 0
     
@@ -335,8 +342,8 @@ def writePCTL(c,pctl):
             for n in nodelayer[key]:
                 tempArr.append(tempR[n])
             tempVal1 = max(tempArr)
-            
-            dfAll.loc[cpt,key] = tempVal1
+            dfAll[key] = np.append(dfAll[key],tempVal1)
+
         cpt = cpt + 1
         
     for p in pctl:
@@ -345,7 +352,7 @@ def writePCTL(c,pctl):
         for key, value in nodeDict.items():
             if key in node2nodevalue.keys():
                 key = node2nodevalue[key]
-            f.write(struct.pack(">f",dfAll[key].quantile(p)))
+            f.write(struct.pack(">f",np.quantile(dfAll[key],p)))
         
         f.write(struct.pack(">l",len(NodeList)*4))
     
@@ -447,7 +454,6 @@ for run in RMAfilenames:
                 print(c)
         
             if option == 'Percentile':
-                df2 = pd.DataFrame()
                 for c in constNum:
                     writePCTL(c,percentiles)
             else: