diff --git a/notebooks/wp5/satellite_sea_ice_type.ipynb b/notebooks/wp5/satellite_sea_ice_type.ipynb
index ffc0926..03d2280 100644
--- a/notebooks/wp5/satellite_sea_ice_type.ipynb
+++ b/notebooks/wp5/satellite_sea_ice_type.ipynb
@@ -169,7 +169,7 @@
     "    da_nersc = da_nersc.drop_vars([\"xc\", \"yc\"])\n",
     "\n",
     "    # Fill variables\n",
-    "    units = (\"$10^6$km$^2$\",)\n",
+    "    units = \"$10^6$km$^2$\"\n",
     "    dataarrays = {}\n",
     "    dataarrays[\"mysi_extent\"] = compute_spatial_sum(da_cds, grid_cell_area)\n",
     "    dataarrays[\"mysi_extent\"].attrs = {\n",
@@ -181,7 +181,7 @@
     "    dataarrays[\"mysi_extent_age\"] = compute_spatial_sum(da_nersc, grid_cell_area)\n",
     "    dataarrays[\"mysi_extent_age\"].attrs = {\n",
     "        \"standard_name\": \"multi_year_sea_ice_extent_age\",\n",
-    "        \"units\": \"$10^6$km$^2$\",\n",
+    "        \"units\": units,\n",
     "        \"long_name\": \"Multi-year sea ice extent from NERSC sea ice age product\",\n",
     "    }\n",
     "\n",
@@ -190,14 +190,14 @@
     "    dataarrays[\"mysi_extent_bias\"] = over - under\n",
     "    dataarrays[\"mysi_extent_bias\"].attrs = {\n",
     "        \"standard_name\": \"multi_year_sea_ice_extent_bias\",\n",
-    "        \"units\": \"$10^6$km$^2$\",\n",
+    "        \"units\": units,\n",
     "        \"long_name\": \"Multi-year sea ice extent bias\",\n",
     "    }\n",
     "\n",
     "    dataarrays[\"iite\"] = over + under\n",
     "    dataarrays[\"iite\"].attrs = {\n",
     "        \"standard_name\": \"integrated_ice_type_error\",\n",
-    "        \"units\": \"$10^6$km$^2$\",\n",
+    "        \"units\": units,\n",
     "        \"long_name\": \"Integrated ice type error\",\n",
     "    }\n",
     "    return xr.Dataset(dataarrays)"