diff --git "a/position_layouts_center.json" "b/position_layouts_center.json"
new file mode 100644--- /dev/null
+++ "b/position_layouts_center.json"
@@ -0,0 +1,7682 @@
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+      "book",
+      "book",
+      "book"
+    ],
+    "box_ids": [
+      7100,
+      7101,
+      7102,
+      7103
+    ],
+    "caption": "a photo of 4 books",
+    "split": "center"
+  },
+  {
+    "file_name": "position_center_4_bus_iter3.png",
+    "id": 1757,
+    "count": 4,
+    "class": "bus",
+    "boxes_normalized": [
+      [
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+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
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+        0.6015625,
+        0.49609375,
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+      ],
+      [
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+    ],
+    "box_captions": [
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+      "bus",
+      "bus",
+      "bus"
+    ],
+    "box_ids": [
+      7108,
+      7109,
+      7110,
+      7111
+    ],
+    "caption": "a photo of 4 buses",
+    "split": "center"
+  },
+  {
+    "file_name": "position_center_4_clock_iter3.png",
+    "id": 1759,
+    "count": 4,
+    "class": "clock",
+    "boxes_normalized": [
+      [
+        0.466796875,
+        0.716796875,
+        0.64453125,
+        0.841796875
+      ],
+      [
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+        0.6015625,
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+        0.466796875,
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+      ],
+      [
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+        0.345703125,
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+    ],
+    "box_captions": [
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+      "clock",
+      "clock",
+      "clock"
+    ],
+    "box_ids": [
+      7116,
+      7117,
+      7118,
+      7119
+    ],
+    "caption": "a photo of 4 clocks",
+    "split": "center"
+  }
+]
\ No newline at end of file