diff --git a/python/obitools3/dms/column/column.pxd b/python/obitools3/dms/column/column.pxd
index f296474..405deff 100644
--- a/python/obitools3/dms/column/column.pxd
+++ b/python/obitools3/dms/column/column.pxd
@@ -31,7 +31,8 @@ cdef class Column(OBIWrapper) :
 
 cdef class Column_multi_elts(Column) :
 
-    cpdef set_line(self, index_t line_nb, dict values)
+    # The type of [values] can be dict, Column_line, or any other class with values referenced by keys with an iterator [for key in values]
+    cpdef set_line(self, index_t line_nb, object values)
 
 
 cdef class Column_line:
diff --git a/python/obitools3/dms/column/column.pyx b/python/obitools3/dms/column/column.pyx
index 43c5f99..9ce73ae 100644
--- a/python/obitools3/dms/column/column.pyx
+++ b/python/obitools3/dms/column/column.pyx
@@ -1,4 +1,5 @@
 #cython: language_level=3
+
 from obitools3.dms.column import typed_column
  
 
@@ -73,7 +74,7 @@ cdef class Column(OBIWrapper) :
         cdef bytes comments_b = tobytes(comments)
         cdef bytes elements_names_b
         cdef char* elements_names_p
-        
+
         if not view.active() :
             raise OBIObjectClosedInstance()
  
@@ -85,7 +86,7 @@ cdef class Column(OBIWrapper) :
             elements_names_p = elements_names_b
         else:
             elements_names_p = NULL
-                             
+                                
         if (obi_view_add_column(view                      = view.pointer(),
                                 column_name               = column_name_b,
                                 version_number            = -1,
@@ -101,7 +102,7 @@ cdef class Column(OBIWrapper) :
                                 create                    = True)<0):
             raise RuntimeError("Cannot create column %s in view %s" % (bytes2str(column_name_b),
                                                                        bytes2str(view.name)))
-                
+
         return Column.open(view, alias_b)
  
  
@@ -175,7 +176,7 @@ cdef class Column(OBIWrapper) :
                                ))
             
         view.register(self)
- 
+        
  
     def __len__(self):
         '''
@@ -222,7 +223,7 @@ cdef class Column(OBIWrapper) :
         cdef bytes s
         s = self._alias + b", original name: " + self.original_name + b", version " + str2bytes(str(self.version)) + b", data type: " + self.data_type
         return bytes2str(s)     # TODO can't return bytes
-         
+
          
     cpdef close(self):  # TODO discuss, can't be called bc then bug when closing view that tries to close it in C
     
@@ -293,7 +294,7 @@ cdef class Column_multi_elts(Column) :
     def __getitem__(self, index_t line_nb):
         return Column_line(self, line_nb)
     
-    cpdef set_line(self, index_t line_nb, dict values):
+    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])