diff --git a/python/obitools3/commands/cat.pyx b/python/obitools3/commands/cat.pyx
index 45e2591..457496e 100755
--- a/python/obitools3/commands/cat.pyx
+++ b/python/obitools3/commands/cat.pyx
@@ -48,9 +48,9 @@ def run(config):
     
     logger("info", "obi cat")
 
-    # Open the views to concatenate
-    iview_list = []
+    # Check the views to concatenate
     idms_list = []
+    iview_list = []
     total_len = 0
     remove_qual = False
     remove_rev_qual = False
@@ -68,8 +68,9 @@ def run(config):
         if REVERSE_QUALITY_COLUMN not in i_view: # same as above for reverse quality
             remove_rev_qual = True
         total_len += len(i_view)
-        iview_list.append(i_view)
         idms_list.append(i_dms)
+        iview_list.append(i_view.name)
+        i_view.close()
 
     # Open the output: only the DMS
     output = open_uri(config['obi']['outputURI'],
@@ -98,8 +99,10 @@ def run(config):
     # Initialize multiple elements columns
     if type(output_0)==BufferedWriter: 
         dict_cols = {}
-        for v in iview_list:
+        for v_uri in config["cat"]["views_to_cat"]:
+            v = open_uri(v_uri)[1]
             for coln in v.keys():
+                col = v[coln]
                 if v[coln].nb_elements_per_line > 1:
                     if coln not in dict_cols:
                         dict_cols[coln] = {}
@@ -109,6 +112,7 @@ def run(config):
                     else:
                         dict_cols[coln]['eltnames'] = set(v[coln].elements_names + list(dict_cols[coln]['eltnames']))
                         dict_cols[coln]['nbelts'] = len(dict_cols[coln]['eltnames'])
+            v.close()            
         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']))
@@ -120,7 +124,8 @@ def run(config):
         pb = None
     
     i = 0
-    for v in iview_list:
+    for v_uri in config["cat"]["views_to_cat"]:
+        v = open_uri(v_uri)[1]
         for entry in v:
             PyErr_CheckSignals()
             if pb is not None:
@@ -131,6 +136,7 @@ def run(config):
             else:
                 o_view[i] = entry
             i+=1
+        v.close()
 
     # Deletes quality columns if needed
     if type(output_0)!=BufferedWriter: 
@@ -145,7 +151,7 @@ def run(config):
     
     # Save command config in DMS comments
     command_line = " ".join(sys.argv[1:])
-    o_view.write_config(config, "cat", command_line, input_dms_name=[d.name for d in idms_list], input_view_name=[v.name for v in iview_list])
+    o_view.write_config(config, "cat", command_line, input_dms_name=[d.name for d in idms_list], input_view_name=[vname for vname in iview_list])
     o_dms.record_command_line(command_line)
 
     #print("\n\nOutput view:\n````````````", file=sys.stderr)
diff --git a/python/obitools3/version.py b/python/obitools3/version.py
index efd1e13..40155f4 100755
--- a/python/obitools3/version.py
+++ b/python/obitools3/version.py
@@ -1,5 +1,5 @@
 major = 3
 minor = 0
-serial= '0b33'
+serial= '0b34'
 
 version ="%d.%d.%s" % (major,minor,serial)