diff --git a/python/obitools3/commands/cat.pyx b/python/obitools3/commands/cat.pyx
index dee708c..6797edd 100755
--- a/python/obitools3/commands/cat.pyx
+++ b/python/obitools3/commands/cat.pyx
@@ -86,7 +86,24 @@ def run(config):
     if not remove_rev_qual:
         Column.new_column(o_view, REVERSE_SEQUENCE_COLUMN, OBI_SEQ)
         Column.new_column(o_view, REVERSE_QUALITY_COLUMN, OBI_QUAL, associated_column_name=REVERSE_SEQUENCE_COLUMN, associated_column_version=o_view[REVERSE_SEQUENCE_COLUMN].version)
-
+        
+    # Initialize multiple elements columns
+    dict_cols = {}
+    for v in iview_list:
+        for coln in v.keys():
+            if v[coln].nb_elements_per_line > 1:
+                if coln not in dict_cols:
+                    dict_cols[coln] = {}
+                    dict_cols[coln]['eltnames'] = set(v[coln].elements_names)
+                    dict_cols[coln]['nbelts'] = v[coln].nb_elements_per_line
+                    dict_cols[coln]['obitype'] = v[coln].data_type_int
+                else:
+                    dict_cols[coln]['eltnames'] = set(v[coln].elements_names + list(dict_cols[coln]['eltnames']))
+                    dict_cols[coln]['nbelts'] = len(dict_cols[coln]['eltnames'])
+    for coln in dict_cols:
+        Column.new_column(o_view, coln, dict_cols[coln]['obitype'], 
+                          nb_elements_per_line=dict_cols[coln]['nbelts'], elements_names=list(dict_cols[coln]['eltnames']))
+    
     # Initialize the progress bar
     pb = ProgressBar(total_len, config, seconde=5)