diff --git a/modules/contrail/util.py b/modules/contrail/util.py
index c898e77954efb24e3cd864018f0cef418bdab296..70131356bb5634817a42086202b07d28badcf46f 100644
--- a/modules/contrail/util.py
+++ b/modules/contrail/util.py
@@ -120,13 +120,13 @@ def extract(mask_image, image_ts, clavrx_path):
             all_list.append((press_level, press, lat, lon, temp_value, rh_value, horz_shear_value, static_value, horz_wind_spd_value, vert_shear_value))
 
     # Create pandas DataFrame for each list of tuples in voxel_dict
-    voxel_dict_df = {}
+    levels_dict_df = {}
     for k, v in levels_dict.items():
         print('pressure level, number of contrail points: ', k, len(v))
         df = pd.DataFrame(v,
                           columns=["pressure", "lat", "lon", "temperature", "relative_humidity",
                                    "horz_shear_deform", "static_stability", "horz_wind_speed", "vert_wind_shear"])
-        voxel_dict_df[k] = df
+        levels_dict_df[k] = df
 
     # Create a DataFrame for all tuples
     all_df = pd.DataFrame(all_list,