diff --git a/notebooks/wp3/bias_assessment.ipynb b/notebooks/wp3/bias_assessment.ipynb
index c611b2e..21b9bb3 100644
--- a/notebooks/wp3/bias_assessment.ipynb
+++ b/notebooks/wp3/bias_assessment.ipynb
@@ -87,6 +87,7 @@
     "}\n",
     "\n",
     "# Regions\n",
+    "defined_regions_module_name = \"ar6.land\"\n",
     "regions = [\n",
     "    \"CAR\",\n",
     "    \"ENA\",\n",
@@ -97,8 +98,6 @@
     "    \"SEA\",\n",
     "    \"WNA\",\n",
     "]\n",
-    "defined_regions = regionmask.defined_regions.ar6.land\n",
-    "assert set(regions) <= set(defined_regions.abbrevs)\n",
     "\n",
     "# Ploting settings\n",
     "plot_kwargs = {\n",
@@ -121,6 +120,16 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "def get_defined_regions(defined_regions_module_name):\n",
+    "    defined_regions = regionmask.defined_regions\n",
+    "    for module in defined_regions_module_name.split(\".\"):\n",
+    "        defined_regions = getattr(defined_regions, module)\n",
+    "    return defined_regions\n",
+    "\n",
+    "\n",
+    "defined_regions = get_defined_regions(defined_regions_module_name)\n",
+    "assert set(regions) <= set(defined_regions.abbrevs)\n",
+    "\n",
     "ax = defined_regions[regions].plot(\n",
     "    projection=ccrs.Robinson(),\n",
     "    label=\"abbrev\",\n",
@@ -183,8 +192,9 @@
    "outputs": [],
    "source": [
     "def regionalised_spatial_weighted_mean(\n",
-    "    ds, region, defined_regions, weights, mean_dims=None\n",
+    "    ds, region, defined_regions_module_name, weights, mean_dims=None\n",
     "):\n",
+    "    defined_regions = get_defined_regions(defined_regions_module_name)\n",
     "    mask = defined_regions.mask(ds)\n",
     "    index = defined_regions.map_keys(region)\n",
     "    ds = ds.where((mask == index).compute(), drop=True)\n",
@@ -363,7 +373,7 @@
     "            transform_func=regionalised_spatial_weighted_mean,\n",
     "            transform_func_kwargs={\n",
     "                \"region\": region,\n",
-    "                \"defined_regions\": defined_regions,\n",
+    "                \"defined_regions_module_name\": defined_regions_module_name,\n",
     "                \"weights\": True,\n",
     "            },\n",
     "        )\n",
@@ -410,7 +420,7 @@
     "                transform_func=regionalised_spatial_weighted_mean,\n",
     "                transform_func_kwargs={\n",
     "                    \"region\": region,\n",
-    "                    \"defined_regions\": defined_regions,\n",
+    "                    \"defined_regions_module_name\": defined_regions_module_name,\n",
     "                    \"weights\": True,\n",
     "                    \"mean_dims\": (\"realization\",),\n",
     "                },\n",