diff --git a/tree_compresser/tests/open_climate_dt.py b/tree_compresser/tests/open_climate_dt.py
index e4c9a42..4af8fbb 100644
--- a/tree_compresser/tests/open_climate_dt.py
+++ b/tree_compresser/tests/open_climate_dt.py
@@ -1,8 +1,9 @@
-from tree_traverser import backend, CompressedTree
-from pathlib import Path
 import json
+from pathlib import Path
 
-data_path = Path("data/compressed_tree_climate_dt.json")
+from tree_traverser import CompressedTree
+
+data_path = Path("data/compressed_tree_climate_dt_ecmwf_style.json")
 # Print size of file
 print(f"climate dt compressed tree: {data_path.stat().st_size // 1e6:.1f} MB")
 
diff --git a/tree_compresser/tests/reconstruct.py b/tree_compresser/tests/reconstruct.py
new file mode 100644
index 0000000..7535fa4
--- /dev/null
+++ b/tree_compresser/tests/reconstruct.py
@@ -0,0 +1,43 @@
+from pathlib import Path
+
+from tree_traverser import CompressedTree, RefcountedDict
+
+
+class CompressedTreeFixed(CompressedTree):
+    @classmethod
+    def from_json(cls, data : dict):
+        c = cls({})
+        c.cache = {}
+        ca = data["cache"]
+        for k, v in ca.items():
+            g = {k2 : ca[str(v2)]["dict"][k2] if k2 in ca[str(v2)]["dict"] else v2 for k2, v2 in v["dict"].items()}
+            c.cache[int(k)] = RefcountedDict(g)
+            c.cache[int(k)].refcount = v["refcount"]
+
+        c.root_hash = data["root_hash"]
+        c.tree = c.cache[c.root_hash]
+        return c
+    
+    def reconstruct(self, max_depth=None) -> dict[str, dict]:
+        "Reconstruct the tree as a normal nested dictionary"
+        def reconstruct_node(h : int, depth : int) -> dict[str, dict]:
+            if max_depth is not None and depth > max_depth:
+                return {}
+            return {k : reconstruct_node(v, depth=depth+1) for k, v in self.cache[h].items()}
+        return reconstruct_node(self.root_hash, depth = 0)
+    
+
+data_path = Path("data/compressed_tree_climate_dt.json")
+# Print size of file
+print(f"climate dt compressed tree: {data_path.stat().st_size // 1e6:.1f} MB")
+
+print("Opening json file")
+compressed_tree = CompressedTreeFixed.load(data_path)
+
+output_data_path = Path("data/compressed_tree_climate_dt_ecmwf_style.json")
+# Print size of file
+
+compressed_tree.save(output_data_path)
+
+print(f"climate dt compressed tree ecmwf style: {output_data_path.stat().st_size // 1e6:.1f} MB")
+