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diff --git a/extract_excess.py b/extract_excess.py
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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Extract the excess value and ratio results.
+#
+# Aaron LI
+# Created: 2016-04-27
+#
+
+import sys
+import os
+import json
+import csv
+import argparse
+from collections import OrderedDict
+
+
+def extract_excess(data):
+    """
+    Extract the excess value and ratio as well as other misc information
+    from the "data" dictionary.
+    """
+    results = OrderedDict([
+            ("name",             data["name"]),
+            ("obsid",            data["obsid"]),
+            ("model",            data["model"]),
+            ("brightness_obs",   data["brightness_obs"]),
+            ("brightness_model", data["brightness_model"]),
+            ("excess_value",     data["excess_value"]),
+            ("excess_ratio",     data["excess_ratio"]),
+    ])
+    return results
+
+
+def main():
+    parser = argparse.ArgumentParser(
+            description="Extract excess results from excess.json")
+    parser.add_argument("excess_json", nargs="?", default="excess.json",
+            help="json file conatins excess results (default: excess.json)")
+    args = parser.parse_args()
+
+    excess_data = json.load(open(args.excess_json))
+    results = extract_excess(excess_data)
+
+    # output results
+    csv_writer = csv.writer(sys.stdout)
+    csv_writer.writerow(results.keys())
+    csv_writer.writerow(results.values())
+
+
+if __name__ == "__main__":
+    main()
+