diff --git a/python/obitools3/dms/column/column.pyx b/python/obitools3/dms/column/column.pyx
index 9ce73ae..ea7f6c7 100644
--- a/python/obitools3/dms/column/column.pyx
+++ b/python/obitools3/dms/column/column.pyx
@@ -297,7 +297,7 @@ cdef class Column_multi_elts(Column) :
     cpdef set_line(self, index_t line_nb, object values):
         for element_name in values :
             self.set_item(line_nb, element_name, values[element_name])
-
+            
 
 ######################################################################################################
 
@@ -324,7 +324,15 @@ cdef class Column_line :
     def __repr__(self) :
         return str(self._column.get_line(self._index))
  
-     
+    
+    def __iter__(self) :
+        cdef list  elements_names
+        cdef bytes element_name
+        elements_names = self._column.elements_names
+        for element_name in elements_names :
+            yield element_name
+        
+    
     cpdef update(self, data):       # TODO ?????
         if isinstance(data, dict):
             data=data.items()