diff --git a/Analysis/eddy_dump.py b/Analysis/eddy_dump.py
index 7e2eb26e3e03b8ef89957aa9fda4cb76484e8e60..36991536e868222281594c1860c1e1309fc4fb06 100755
--- a/Analysis/eddy_dump.py
+++ b/Analysis/eddy_dump.py
@@ -4,15 +4,27 @@ import argparse
 import shapefile
 from os import path
 import pprint
+import sys
 
 parser = argparse.ArgumentParser()
 parser.add_argument("directory", help = "containing the three shapefiles")
 args = parser.parse_args()
 
-eddy_index = input("eddy_index = ? ")
-eddy_index = int(eddy_index)
-ishape = eddy_index - 1
+reply = input("date_index, eddy_index = ? ").split(",")
+date_index = int(reply[0])
+eddy_index = int(reply[1])
 
+# Find ishape:
+
+filename = path.join(args.directory, "extremum")
+
+with shapefile.Reader(filename) as f:
+    for ishape, rec in enumerate(f.iterRecords()):
+        if rec["date_index"] == date_index and rec["eddy_index"] == eddy_index:
+            break
+    else:
+        sys.exit("Not found")
+        
 for basename in ["extremum", "outermost_contour", "max_speed_contour"]:
     filename = path.join(args.directory, basename)
     
diff --git a/Documentation_texfol/documentation.tex b/Documentation_texfol/documentation.tex
index f53be1a520797a250c39e3b66c23bb97068a5868..c6419f19778a3a56c3bcf0d7242e02ced8004b75 100644
--- a/Documentation_texfol/documentation.tex
+++ b/Documentation_texfol/documentation.tex
@@ -1013,7 +1013,10 @@ extremums à une même date. Donc, dans le shapefile \verb+extremum+
 écrit par un processus donné, les dates sont dans le désordre. En
 outre, deux processus peuvent interpoler des extremums à une même
 date. Il sera certainement utile de concaténer et trier les shapefiles
-en post-traitement.
+en post-traitement. Pour trier, je ne suis pas obligé de charger en
+mémoire vive tous les shapefiles : je peux simplement faire la
+concaténation puis lire dans extremum.dbf par exemple deux suites
+d'entiers \verb+date_index+ et \verb+eddy_index+.
 
 Un processus donné alterne lecture de shapefiles (créés par
 extraction\_eddies) et écriture de shapefiles (contenant les
diff --git a/Tests/Input/NSO_global_nml.txt b/Tests/Input/NSO_global_nml.txt
new file mode 100644
index 0000000000000000000000000000000000000000..ecb671a69fb16250ee25a3eeea6a6cdeb5c52ac4
--- /dev/null
+++ b/Tests/Input/NSO_global_nml.txt
@@ -0,0 +1,3 @@
+&MAIN_NML CORNER_DEG=0.125,-89.875, NLON    =1440 NLAT    =720,
+max_delta = 3 /
+
diff --git a/Tests/short_tests.json b/Tests/short_tests.json
index ce46d06b0583da23e419f7a8c135c6776f3becd9..67e236880ab03550dc4a5374144de88e50e41cf6 100644
--- a/Tests/short_tests.json
+++ b/Tests/short_tests.json
@@ -300,7 +300,7 @@
 		  "$src_dir/Tests/Input/Extraction_eddies_region_2_noise/SHP_triplet",
 		  "$src_dir/Tests/Input/Region_2_2006_01_02/SHP_triplet"],
 	"title" : "Successive_overlap_region_2",
-	"description": "Same as Successive_overlap_different_snapshots, but with a larger region. The identifying numbers of the connected eddies are not the same for all edges.",
+	"description": "Overlap of different snapshots. Same as Successive_overlap_different_snapshots, but with a larger region. The identifying numbers of the connected eddies are not the same for all edges.",
 	"stdin_filename": "$src_dir/Tests/Input/successive_overlap_region_2_nml.txt"
     },
     {
@@ -352,7 +352,7 @@
 		  "$src_dir/Tests/Input/Region_4_2006_01_01/SHP_triplet",
 		  "$src_dir/Tests/Input/Region_4_2006_01_01/SHP_triplet"],
 	"title" : "Non_successive_overlap",
-	"description": "Same as Successive_overlap, except for max_delta.",
+	"description": "Overlap of a snapshot with itself. Same as Successive_overlap, except for max_delta.",
 	"stdin_filename": "$src_dir/Tests/Input/non_successive_overlap_nml.txt"
     },
     {
@@ -360,7 +360,7 @@
 		  "$src_dir/Tests/Input/Region_4_2006_01_01/SHP_triplet",
 		  "$src_dir/Tests/Input/Region_4_2006_01_02/SHP_triplet"],
 	"title" : "NSO_different_snapshots",
-	"description": "Same as Successive_overlap_different_snapshots, except for max_delta.",
+	"description": "Overlap of different snapshots. Same as Successive_overlap_different_snapshots, except for max_delta.",
 	"stdin_filename": "$src_dir/Tests/Input/non_successive_overlap_nml.txt"
     },
     {
@@ -370,5 +370,13 @@
 	"title" : "NSO_region_5",
 	"description": "Same as Successive_overlap_region_5, except for max_delta.",
 	"stdin_filename": "$src_dir/Tests/Input/NSO_region_5_nml.txt"
+    },
+    {
+	"args" : ["$src_dir/mkdir_run.sh", "$build_dir/test_overlap",
+		  "$large_input_dir/SHP_triplet_2006_01_01",
+		  "$large_input_dir/SHP_triplet_2006_01_02"],
+	"title" : "NSO_global",
+	"description": "Same as Successive_overlap_global, except for max_delta.",
+	"stdin_filename": "$src_dir/Tests/Input/NSO_global_nml.txt"
     }
 ]