Index: fact/tools/pyscripts/new_pyfact/pyfact.py
===================================================================
--- fact/tools/pyscripts/new_pyfact/pyfact.py	(revision 17795)
+++ fact/tools/pyscripts/new_pyfact/pyfact.py	(revision 17801)
@@ -154,5 +154,4 @@
                                 self.cols['StartCellData'], 
                                 self.header['NROI']+10)
-                           )
             self.drs_calibrate.CorrectStep(
                                 self.cols['CalibData'], 
@@ -162,8 +161,7 @@
                                 self.cols['StartCellData'], 
                                 3)
-                           )
-        self.fPrevStart.append(self.cols['StartCellData'])
-        if len(self.fPrevStart) > 5:
-            self.fPrevStart.pop(0)
+        self.list_of_previous_start_cells.append(self.cols['StartCellData'])
+        if len(self.list_of_previous_start_cells) > 5:
+            self.list_of_previous_start_cells.pop(0)
 
         for ch in range(self.header['NPIX']):