diff --git a/docs/station_catalog.ipynb b/docs/station_catalog.ipynb
index e0f8e91..9262535 100644
--- a/docs/station_catalog.ipynb
+++ b/docs/station_catalog.ipynb
@@ -16,7 +16,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 15,
+   "execution_count": null,
    "metadata": {
     "editable": true,
     "scrolled": true,
@@ -346,8 +346,8 @@
     "init_notebook_mode(all_interactive=True)\n",
     "\n",
     "# Load stations\n",
-    "solarstations = pd.read_csv('../solarstations.csv', dtype={'Tier': str}).fillna('')\n",
-    "esmap_stations = pd.read_csv('../esmap_stations.csv', dtype={'Tier': str}).fillna('')\n",
+    "solarstations = pd.read_csv('../solarstations.csv')\n",
+    "esmap_stations = pd.read_csv('../esmap_stations.csv')\n",
     "stations = pd.concat([solarstations, esmap_stations], axis='rows', ignore_index=True)\n",
     "\n",
     "with open('../data/country_by_continent.json') as f:\n",