diff --git a/Tests/Input/Region_4/2006_01_01/extremum.dbf b/Tests/Input/Region_4/2006_01_01/Snapshot/extremum.dbf
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/extremum.dbf
rename to Tests/Input/Region_4/2006_01_01/Snapshot/extremum.dbf
diff --git a/Tests/Input/Region_4/2006_01_01/extremum.shp b/Tests/Input/Region_4/2006_01_01/Snapshot/extremum.shp
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/extremum.shp
rename to Tests/Input/Region_4/2006_01_01/Snapshot/extremum.shp
diff --git a/Tests/Input/Region_4/2006_01_01/extremum.shx b/Tests/Input/Region_4/2006_01_01/Snapshot/extremum.shx
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/extremum.shx
rename to Tests/Input/Region_4/2006_01_01/Snapshot/extremum.shx
diff --git a/Tests/Input/Region_4/2006_01_01/max_speed_contour.dbf b/Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.dbf
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/max_speed_contour.dbf
rename to Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.dbf
diff --git a/Tests/Input/Region_4/2006_01_01/max_speed_contour.shp b/Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.shp
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/max_speed_contour.shp
rename to Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.shp
diff --git a/Tests/Input/Region_4/2006_01_01/max_speed_contour.shx b/Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.shx
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/max_speed_contour.shx
rename to Tests/Input/Region_4/2006_01_01/Snapshot/max_speed_contour.shx
diff --git a/Tests/Input/Region_4/2006_01_01/outermost_contour.dbf b/Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.dbf
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/outermost_contour.dbf
rename to Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.dbf
diff --git a/Tests/Input/Region_4/2006_01_01/outermost_contour.shp b/Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.shp
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/outermost_contour.shp
rename to Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.shp
diff --git a/Tests/Input/Region_4/2006_01_01/outermost_contour.shx b/Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.shx
similarity index 100%
rename from Tests/Input/Region_4/2006_01_01/outermost_contour.shx
rename to Tests/Input/Region_4/2006_01_01/Snapshot/outermost_contour.shx
diff --git a/Tests/Input/successive_overlap_nml.txt b/Tests/Input/successive_overlap_nml.txt
index f4f7c4fee69eb4d70a80dedf31691122fcac3700..bdaa2ae247c2803e152e14510ec91e2bc81ced49 100644
--- a/Tests/Input/successive_overlap_nml.txt
+++ b/Tests/Input/successive_overlap_nml.txt
@@ -1,5 +1,5 @@
  &MAIN_NML
- CORNER  = 16.12500       , -38.87500      ,
+ CORNER_deg  = 16.12500       , -38.87500      ,
  NLON    = 20,
  NLAT    = 20
  /
diff --git a/Tests/Input/successive_overlap_periodic_nml.txt b/Tests/Input/successive_overlap_periodic_nml.txt
index 5a0fd63baf4951351ca6f574e2d58f4f1cd4b903..d3d7a77a64325f076baa09355a6720ac8e78dc82 100644
--- a/Tests/Input/successive_overlap_periodic_nml.txt
+++ b/Tests/Input/successive_overlap_periodic_nml.txt
@@ -1,6 +1,6 @@
  &MAIN_NML
- CORNER  = 0.000000       , -81.00000      ,
- STEP    = 20.00000       , 18.00000       ,
+ CORNER_deg  = 0.000000       , -81.00000      ,
+ STEP_deg    = 20.00000       , 18.00000       ,
  NLON    = 18,
  NLAT    = 10,
  DIST_LIM        = 4
diff --git a/Tests/Input/successive_overlap_region_5_nml.txt b/Tests/Input/successive_overlap_region_5_nml.txt
index 7c7e9ef81209a02efb951acfa375cc1322f005ba..a0efab248e9d9a4fe540f2cc0a20fc7fd7ba4ec4 100644
--- a/Tests/Input/successive_overlap_region_5_nml.txt
+++ b/Tests/Input/successive_overlap_region_5_nml.txt
@@ -1,5 +1,5 @@
  &MAIN_NML
- CORNER  = 0.12500       , -59.875,      ,
+ CORNER_deg  = 0.12500       , -59.875,      ,
  NLON    = 120,
  NLAT    = 180
  /
diff --git a/Tests/long_tests.json b/Tests/long_tests.json
index 2db098f8f61f569b0c14fead1aeaf37310bf46f3..8365bf26dec58f1c646e2f6c5d47f91a0057b2e2 100644
--- a/Tests/long_tests.json
+++ b/Tests/long_tests.json
@@ -6,7 +6,7 @@
 	"input": "&main_nml min_amp = 0.001/\n"
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_3",
 	"required": [["$input_dir/h_region_3.nc", "h.nc"],
 		     ["$input_dir/uv_region_3.nc", "uv.nc"]],
@@ -14,7 +14,7 @@
 	"description": "Larger region, 120 x 120. Includes degenerate extrema."
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_3_min",
 	"required": [["$input_dir/h_region_3.nc", "h.nc"],
 		     ["$input_dir/uv_region_3.nc", "uv.nc"]],
@@ -22,7 +22,7 @@
 	"description": "Same as Extraction_eddies_region_3 except with 1 mm minimum amplitude."
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_5",
 	"required": [["$input_dir/h_region_5.nc", "h.nc"],
 		     ["$input_dir/uv_region_5.nc", "uv.nc"]],
diff --git a/Tests/short_tests.json b/Tests/short_tests.json
index ee4db9b0f461ffca3f404fa0bd889711b8ef0dfb..41b484ce06e505a19b61c977b7e3ac4ff87d6e6a 100644
--- a/Tests/short_tests.json
+++ b/Tests/short_tests.json
@@ -137,14 +137,14 @@
 	"input": "&MAIN_NML IND_TARG_EXTR=19,11 /\n"
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_1",
 	"required": [["$input_dir/h_region_1.nc", "h.nc"],
 		     ["$input_dir/uv_region_1.nc", "uv.nc"]],
 	"input": "&main_nml min_amp = 0./\n"
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_1_noise",
 	"required": [["$input_dir/h_region_1.nc", "h.nc"],
 		     ["$input_dir/uv_region_1.nc", "uv.nc"]],
@@ -152,14 +152,14 @@
 	"description" : "Same as Extraction_eddies_region_1 but with non-zero minimal amplitude."
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_2",
 	"required": [["$input_dir/h_region_2.nc", "h.nc"],
 		     ["$input_dir/uv_region_2.nc", "uv.nc"]],
 	"input": "&main_nml min_amp = 0./\n"
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_2_noise",
 	"required": [["$input_dir/h_region_2.nc", "h.nc"],
 		     ["$input_dir/uv_region_2.nc", "uv.nc"]],
@@ -178,7 +178,7 @@
 	"stdin_filename": "$input_dir/inside_4_false_nml.txt"
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_region_4",
 	"required": ["$input_dir/Region_4/2006_01_01/h.nc", "$input_dir/Region_4/2006_01_01/uv.nc"],
 	"input": "&main_nml /\n",
@@ -201,71 +201,15 @@
 	"description": "Area of a multipolygon, with a hole in one polygon."
     },
     {
-	"args": "$compil_prod_dir/test_read_eddy",
+	"args": "$compil_prod_dir/test_read_eddy.sh",
 	"required":
-	[
-	    ["$input_dir/Region_4/2006_01_01/extremum.dbf", "extremum_old.dbf"],
-	    ["$input_dir/Region_4/2006_01_01/extremum.shp", "extremum_old.shp"],
-	    ["$input_dir/Region_4/2006_01_01/extremum.shx", "extremum_old.shx"],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.dbf",
-		"max_speed_contour_old.dbf"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.shp",
-		"max_speed_contour_old.shp"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.shx",
-		"max_speed_contour_old.shx"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.dbf",
-		"outermost_contour_old.dbf"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.shp",
-		"outermost_contour_old.shp"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.shx",
-		"outermost_contour_old.shx"
-	    ]
-	],
+	[["$input_dir/Region_4/2006_01_01/Snapshot", "Snapshot_old"]],
 	"title": "Read_eddy"
     },
     {
-	"args": "$compil_prod_dir/test_read_snapshot",
+	"args": "$compil_prod_dir/test_read_snapshot.sh",
 	"required":
-	[
-	    ["$input_dir/Region_4/2006_01_01/extremum.dbf", "extremum_old.dbf"],
-	    ["$input_dir/Region_4/2006_01_01/extremum.shp", "extremum_old.shp"],
-	    ["$input_dir/Region_4/2006_01_01/extremum.shx", "extremum_old.shx"],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.dbf",
-		"max_speed_contour_old.dbf"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.shp",
-		"max_speed_contour_old.shp"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/max_speed_contour.shx",
-		"max_speed_contour_old.shx"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.dbf",
-		"outermost_contour_old.dbf"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.shp",
-		"outermost_contour_old.shp"
-	    ],
-	    [
-		"$input_dir/Region_4/2006_01_01/outermost_contour.shx",
-		"outermost_contour_old.shx"
-	    ]
-	],
+	[["$input_dir/Region_4/2006_01_01/Snapshot", "Snapshot_old"]],
 	"title": "Read_snapshot",
 	"stdin_filename": "$input_dir/read_snapshot_nml.txt"
     },
@@ -282,9 +226,8 @@
 	"description": "Overlap of a snapshot with itself.",
 	"required":
 	[
-	    "$input_dir/Region_4/2006_01_01/*.dbf",
-	    "$input_dir/Region_4/2006_01_01/*.shx",
-	    "$input_dir/Region_4/2006_01_01/*.shp"
+	    ["$input_dir/Region_4/2006_01_01/Snapshot", "Snapshot_1"],
+	    ["$input_dir/Region_4/2006_01_01/Snapshot", "Snapshot_2"]
 	],
 	"stdin_filename": "$input_dir/successive_overlap_nml.txt"
     },
@@ -293,7 +236,7 @@
 	"title" : "Nearby_extr",
 	"required":
 	[
-	    "$tests_old_dir/Extraction_eddies_region_1_noise/extremum.*",
+	    "$tests_old_dir/Extraction_eddies_region_1_noise/Snapshot/extremum.*",
 	    "$tests_old_dir/Local_extrema/extr_map.nc"
 	]
     },
@@ -303,9 +246,14 @@
 	"description": "Same as Successive_overlap, but with larger domain: region 5 instead of region 4.",
 	"required":
 	[
-	    "$tests_old_dir/Extraction_eddies_region_5/extremum.*",
-	    "$tests_old_dir/Extraction_eddies_region_5/max_speed_contour.*",
-	    "$tests_old_dir/Extraction_eddies_region_5/outermost_contour.*"
+	    [
+		"$tests_old_dir/Extraction_eddies_region_5/Snapshot",
+		"Snapshot_1"
+	    ],
+	    [
+		"$tests_old_dir/Extraction_eddies_region_5/Snapshot",
+		"Snapshot_2"
+	    ]
 	],
 	"stdin_filename": "$input_dir/successive_overlap_region_5_nml.txt"
     },
@@ -331,7 +279,7 @@
 	"description": "test_set_all_outerm with periodicity."
     },
     {
-	"args": "$compil_prod_dir/extraction_eddies",
+	"args": "$compil_prod_dir/extraction_eddies.sh",
 	"title": "Extraction_eddies_periodic",
 	"required": [["$input_dir/h_2006_01_01_coarse.nc", "h.nc"],
 		     ["$input_dir/uv_2006_01_01_coarse.nc", "uv.nc"]],
@@ -344,9 +292,14 @@
 	"description": "Overlap of a snapshot with itself. Global coarse grid.",
 	"required":
 	[
-	    "$tests_old_dir/Extraction_eddies_periodic/*.dbf",
-	    "$tests_old_dir/Extraction_eddies_periodic/*.shx",
-	    "$tests_old_dir/Extraction_eddies_periodic/*.shp"
+	    [
+		"$tests_old_dir/Extraction_eddies_periodic/Snapshot",
+		"Snapshot_1"
+	    ],
+	    [
+		"$tests_old_dir/Extraction_eddies_periodic/Snapshot",
+		"Snapshot_2"
+	    ]
 	],
 	"stdin_filename": "$input_dir/successive_overlap_periodic_nml.txt"
     }
diff --git a/Tests/test_read_eddy.f90 b/Tests/test_read_eddy.f90
index 343378f5ccd2bbdd50a6461a1d172d89cde668d6..cb6a5f15b729085316040574c77d7fba1f58985d 100644
--- a/Tests/test_read_eddy.f90
+++ b/Tests/test_read_eddy.f90
@@ -20,10 +20,11 @@ program test_read_eddy
 
   !-------------------------------------------------------------------------
 
-  call shp_open_03("extremum_old", pszaccess = "rb", hshp = hshp_extremum)
-  call shp_open_03("outermost_contour_old", pszaccess = "rb", &
+  call shp_open_03("Snapshot_old/extremum", pszaccess = "rb", &
+       hshp = hshp_extremum)
+  call shp_open_03("Snapshot_old/outermost_contour", pszaccess = "rb", &
        hshp = hshp_outermost)
-  call shp_open_03("max_speed_contour_old", pszaccess = "rb", &
+  call shp_open_03("Snapshot_old/max_speed_contour", pszaccess = "rb", &
        hshp = hshp_max_speed)
   call read_field_indices(hshp_extremum, hshp_outermost, hshp_max_speed)
   call read_eddy(e, k, i, hshp_extremum, hshp_outermost, hshp_max_speed, &
diff --git a/Tests/test_read_eddy.sh b/Tests/test_read_eddy.sh
new file mode 100755
index 0000000000000000000000000000000000000000..3515a65eaadd6c453063b3920ae33691347aa255
--- /dev/null
+++ b/Tests/test_read_eddy.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -xe
+script_dir=`dirname $0`
+mkdir Snapshot
+$script_dir/test_read_eddy
diff --git a/Tests/test_read_snapshot.f90 b/Tests/test_read_snapshot.f90
index 19f330976f29d4f73851b88f8c73467d9d827aa6..0682f08bc3788b9eda6b3efaaadbc0cf9d518565 100644
--- a/Tests/test_read_snapshot.f90
+++ b/Tests/test_read_snapshot.f90
@@ -49,10 +49,11 @@ program test_read_snapshot
   if (periodic) call assert(2 * dist_lim * step(1) < 180., &
        "test_read_snapshot dist_lim")
 
-  call shp_open_03("extremum_old", pszaccess = "rb", hshp = hshp_extremum)
-  call shp_open_03("outermost_contour_old", pszaccess = "rb", &
+  call shp_open_03("Snapshot_old/extremum", pszaccess = "rb", &
+       hshp = hshp_extremum)
+  call shp_open_03("Snapshot_old/outermost_contour", pszaccess = "rb", &
        hshp = hshp_outermost)
-  call shp_open_03("max_speed_contour_old", pszaccess = "rb", &
+  call shp_open_03("Snapshot_old/max_speed_contour", pszaccess = "rb", &
        hshp = hshp_max_speed)
   call read_field_indices(hshp_extremum, hshp_outermost, hshp_max_speed)
   call read_snapshot(s, k, hshp_extremum, hshp_outermost, hshp_max_speed, &
diff --git a/Tests/test_read_snapshot.sh b/Tests/test_read_snapshot.sh
new file mode 100755
index 0000000000000000000000000000000000000000..e2305419a4f672045b6fc07ae77b075eb0d5a630
--- /dev/null
+++ b/Tests/test_read_snapshot.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -xe
+script_dir=`dirname $0`
+mkdir Snapshot
+$script_dir/test_read_snapshot
diff --git a/Tests/test_successive_overlap.f90 b/Tests/test_successive_overlap.f90
index 6d42e716ba56987f7b338114de9cb70d67bb45d7..14996a291881bef43604951cce3fcb810bd59ac5 100644
--- a/Tests/test_successive_overlap.f90
+++ b/Tests/test_successive_overlap.f90
@@ -21,10 +21,13 @@ program test_successive_overlap
   TYPE(shpfileobject) hshp_outermost ! shapefile outermost_contour
   TYPE(shpfileobject) hshp_max_speed ! shapefile max_speed_contour
 
-  real:: corner(2) = [huge(0.), huge(0.)]
+  real:: corner_deg(2) = [huge(0.), huge(0.)], corner(2)
   ! longitude and latitude of the corner of the whole grid, in degrees
+  ! and in rad
 
-  real:: step(2) = [0.25, 0.25] ! longitude and latitude steps, in degrees
+  real:: step_deg(2) = [0.25, 0.25], step(2)
+  ! longitude and latitude steps, in degrees and in rad
+  
   logical periodic ! grid is periodic in longitude
   integer:: nlon = - 1, nlat = - 1
 
@@ -32,7 +35,7 @@ program test_successive_overlap
   ! We look for an overlapping eddy at dist_lim (in grid points) of
   ! the first extremum.
 
-  namelist /main_nml/ corner, step, nlon, nlat, dist_lim
+  namelist /main_nml/ corner_deg, step_deg, nlon, nlat, dist_lim
 
   !-------------------------------------------------------------------------
 
@@ -42,21 +45,37 @@ program test_successive_overlap
   write(unit = *, nml = main_nml)
 
   ! As we are requiring the grid spacing to be uniform, the value of
-  ! "periodic" may be deduced from the values of step(1) and nlon:
-  periodic = nint(360. / step(1)) == nlon
+  ! "periodic" may be deduced from the values of step_deg(1) and nlon:
+  periodic = nint(360. / step_deg(1)) == nlon
   print *, "periodic = ", periodic
-  if (periodic) call assert(2 * dist_lim * step(1) < 180., &
+  if (periodic) call assert(2 * dist_lim * step_deg(1) < 180., &
        "test_successive_overlap dist_lim")
 
-  call shp_open_03("extremum", pszaccess = "rb", hshp = hshp_extremum)
-  call shp_open_03("outermost_contour", pszaccess = "rb", &
+  corner = corner_deg * deg_to_rad
+  step = step_deg * deg_to_rad
+
+  call shp_open_03("Snapshot_1/extremum", pszaccess = "rb", &
+       hshp = hshp_extremum)
+  call shp_open_03("Snapshot_1/outermost_contour", pszaccess = "rb", &
        hshp = hshp_outermost)
-  call shp_open_03("max_speed_contour", pszaccess = "rb", &
+  call shp_open_03("Snapshot_1/max_speed_contour", pszaccess = "rb", &
        hshp = hshp_max_speed)
   call read_field_indices(hshp_extremum, hshp_outermost, hshp_max_speed)
   call read_snapshot(flow(1), k, hshp_extremum, hshp_outermost, &
-       hshp_max_speed, corner * deg_to_rad, step * deg_to_rad, nlon, nlat, &
-       periodic, dist_lim)
+       hshp_max_speed, corner, step, nlon, nlat, periodic, dist_lim)
+  CALL shpclose(hshp_extremum)
+  CALL shpclose(hshp_outermost)
+  CALL shpclose(hshp_max_speed)
+
+  call shp_open_03("Snapshot_2/extremum", pszaccess = "rb", &
+       hshp = hshp_extremum)
+  call shp_open_03("Snapshot_2/outermost_contour", pszaccess = "rb", &
+       hshp = hshp_outermost)
+  call shp_open_03("Snapshot_2/max_speed_contour", pszaccess = "rb", &
+       hshp = hshp_max_speed)
+  ! We assume that the field indices are the same than in snapshot_1.
+  call read_snapshot(flow(2), k, hshp_extremum, hshp_outermost, &
+       hshp_max_speed, corner, step, nlon, nlat, periodic, dist_lim)
   CALL shpclose(hshp_extremum)
   CALL shpclose(hshp_outermost)
   CALL shpclose(hshp_max_speed)
@@ -73,7 +92,7 @@ program test_successive_overlap
   write(unit_edgelist, fmt = *) "k1 i1 k2 i2 weight"
 
   call successive_overlap(flow, unit_edgelist, nlon, nlat, periodic, dist_lim, &
-       j = 2, k = k + 1)
+       j = 2, k = k)
   close(unit_edgelist)
   print *, 'Created file "edgelist.csv".'
 
diff --git a/extraction_eddies.f90 b/extraction_eddies.f90
index b571c46a032aea6e96bf4f6431f5b800b981e5a6..5f04e0a673766c94271b5ac83a42eb8d8c8988db 100644
--- a/extraction_eddies.f90
+++ b/extraction_eddies.f90
@@ -191,10 +191,10 @@ program extraction_eddies
 
   print *, "Number of extrema:", s%number_vis_extr
   CALL shpclose(hshp_extremum)
-  print *, 'Created shapefile "extremum".'
+  print *, 'Created shapefile "Snapshot/extremum".'
   CALL shpclose(hshp_outermost)
-  print *, 'Created shapefile "outermost_contour".'
+  print *, 'Created shapefile "Snapshot/outermost_contour".'
   CALL shpclose(hshp_max_speed)
-  print *, 'Created shapefile "max_speed_contour".'
+  print *, 'Created shapefile "Snapshot/max_speed_contour".'
 
 end program extraction_eddies
diff --git a/extraction_eddies.sh b/extraction_eddies.sh
new file mode 100755
index 0000000000000000000000000000000000000000..78c8655b5b2de0b774582791b685fcd1aecf3588
--- /dev/null
+++ b/extraction_eddies.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+set -xe
+script_dir=`dirname $0`
+mkdir Snapshot
+$script_dir/extraction_eddies
diff --git a/init_shapefiles.f90 b/init_shapefiles.f90
index c262ac461a344397f2a147bd4aaa5beaefef3f66..cb219ac854b8cdce3ec8d500f995276a421087c6 100644
--- a/init_shapefiles.f90
+++ b/init_shapefiles.f90
@@ -28,7 +28,7 @@ contains
 
     !---------------------------------------------------------------------
 
-    call shp_create_03("extremum", shpt_point, hshp_extremum)
+    call shp_create_03("Snapshot/extremum", shpt_point, hshp_extremum)
     call dbf_add_field_03(ifield_extr_ssh, hshp_extremum, 'ssh', ftdouble, &
          nwidth = 13, ndecimals = 6)
     call dbf_add_field_03(ifield_extr_date, hshp_extremum, 'date_index', &
@@ -44,7 +44,8 @@ contains
     call dbf_add_field_03(ifield_extr_speed, hshp_extremum, 'speed', ftdouble, &
          nwidth = 13, ndecimals = 6)
 
-    call shp_create_03("outermost_contour", shpt_polygon, hshp_outermost)
+    call shp_create_03("Snapshot/outermost_contour", shpt_polygon, &
+         hshp_outermost)
     call dbf_add_field_03(ifield_out_r_eq_area, hshp_outermost, &
          'r_eq_area', ftdouble, nwidth = 10, ndecimals = 4)
     call dbf_add_field_03(ifield_out_ssh, hshp_outermost, 'ssh', ftdouble, &
@@ -56,7 +57,8 @@ contains
     call dbf_add_field_03(ifield_out_radius4, hshp_outermost, 'radius4', &
          ftinteger, nwidth = 2, ndecimals = 0)
 
-    call shp_create_03("max_speed_contour", shpt_polygon, hshp_max_speed)
+    call shp_create_03("Snapshot/max_speed_contour", shpt_polygon, &
+         hshp_max_speed)
     call dbf_add_field_03(ifield_max_speed_r_eq_area, hshp_max_speed, &
          'r_eq_area', ftdouble, nwidth = 10, ndecimals = 4)
     call dbf_add_field_03(ifield_max_speed_ssh, hshp_max_speed, 'ssh', &