Index: fact/tools/pyscripts/pyfact/factfits.py
===================================================================
--- fact/tools/pyscripts/pyfact/factfits.py	(revision 13406)
+++ fact/tools/pyscripts/pyfact/factfits.py	(revision 13407)
@@ -45,4 +45,10 @@
 
     def _make_meta_dict(self):
+        """ This method retrieves meta information about the fits file and 
+            stores this information in a dict
+            return: dict
+                key: string - all capital letters
+                value: tuple( numerical value, string comment)
+        """
         # intermediate variables for file metadata dict generation
         keys=self.GetPy_KeyKeys()
@@ -81,4 +87,16 @@
 
     def _make_columns_dict(self):
+        """ This method retrieves information about the columns
+            stored inside the fits files internal binary table.
+            returns: dict
+                key:    string column name -- all capital letters
+                values: tuple(
+                    number of elements in table field - integer
+                    size of element in bytes -- this is not really interesting for any user
+                            might be ommited in future versions
+                    type - a single character code -- should be translated into 
+                            a comrehensible word
+                    unit - string like 'mV' or 'ADC count'
+        """
         # intermediate variables for file table-metadata dict generation
         keys=self.GetPy_ColumnKeys()
@@ -291,12 +309,5 @@
                     self.stacked_cols[col] = np.vstack( (self.stacked_cols[col],self.dict[col]) ) 
                 else:
-#                elif isinstance(self.dict[col], ctypes._SimpleCData):
                     self.stacked_cols[col] = np.vstack( (self.stacked_cols[col],np.array(self.dict[col])) )
-                #else:
-                    #raise TypeError("I don't know how to stack "+col+". It is of type: "+str(type(self.dict[col])))
- 
-                    
-                    
-                    
             self._current_row += 1
         else: