diff --git a/python/obitools3/obidms/_obidms.pxd b/python/obitools3/obidms/_obidms.pxd
index 01dce97..2fe4986 100644
--- a/python/obitools3/obidms/_obidms.pxd
+++ b/python/obitools3/obidms/_obidms.pxd
@@ -10,14 +10,14 @@ from ._obitaxo          cimport OBI_Taxonomy
 cdef class OBIDMS_column:
 
     cdef  str                column_name
-    cdef  str                column_alias              # associated property: alias
+    cdef  str                column_alias               # associated property: alias
     cdef  OBIDMS_column_p*   pointer
     cdef  OBIDMS             dms
     cdef  OBIView            view
     cdef  str                data_type
     cdef  str                dms_name
-    cdef  index_t            nb_elements_per_line
-    cdef  list               elements_names            # associated property: elements_names
+    cdef  index_t            nb_elements_per_line       # associated property: nb_elements_per_line
+    cdef  list               elements_names             # associated property: elements_names
         
     cpdef str     get_data_type(self)
     cpdef index_t get_nb_lines_used(self)
diff --git a/python/obitools3/obidms/_obidms.pyx b/python/obitools3/obidms/_obidms.pyx
index 19fb0af..47ba9c2 100644
--- a/python/obitools3/obidms/_obidms.pyx
+++ b/python/obitools3/obidms/_obidms.pyx
@@ -165,11 +165,16 @@ cdef class OBIDMS_column :
     def alias(self, new_alias):
         self.view.change_column_alias(self.column_alias, new_alias)
 
-    # Element names property getter
+    # elements_names property getter
     @property
     def elements_names(self):
         return self.elements_names
 
+    # nb_elements_per_line property getter
+    @property
+    def nb_elements_per_line(self):
+        return self.nb_elements_per_line
+
     @staticmethod
     cdef object get_subclass_type(OBIDMS_column_p column_p) :