diff --git a/modules/contrail/util.py b/modules/contrail/util.py
index 368b7f17f04cc8ccc27808db436a0066a7a801c3..20233e5aaf9567dbe3ff6e8a444f90b59bf04f29 100644
--- a/modules/contrail/util.py
+++ b/modules/contrail/util.py
@@ -69,7 +69,7 @@ def extract(mask_image, image_ts, clavrx_path):
     contrail_lats = contrail_lats[keep]
 
     # Indexes of contrail_press for individual bins
-    bins = np.arange(100, 1000, 100)
+    bins = np.arange(100, 1000, 50)
     binned_indexes = np.digitize(contrail_press, bins)
 
     # Store the indexes in a dictionary where the key is the bin number and value is the list of indexes
@@ -110,6 +110,14 @@ def extract(mask_image, image_ts, clavrx_path):
     horz_wind_spd_3d = wind_speed(uwind_3d, vwind_3d)
     vert_shear_3d = first_derivative(horz_wind_spd_3d, axis=0, x=temp_3d.coords['Pressure'] * units.hPa)
 
+    voxel_dict = {key: [] for key in bins_dict.keys()}
+    for key in bins_dict.keys():
+        print('working on pressure level: ', bins[key])
+        for c_idx in bins_dict[key]:
+            lon = contrail_lons[c_idx]
+            lat = contrail_lats[c_idx]
+            press = contrail_press[c_idx]
+
     xr_dataset.close()