diff --git a/notebooks/01-plotting_intro.ipynb b/notebooks/01-plotting_intro.ipynb
index e11c8e8..f302377 100644
--- a/notebooks/01-plotting_intro.ipynb
+++ b/notebooks/01-plotting_intro.ipynb
@@ -165,7 +165,13 @@
     "from IPython.display import HTML, display\n",
     "\n",
     "# Group by latitude and longitude\n",
-    "grouped = df.groupby([\"latitude\", \"longitude\"]).size().reset_index().drop(columns=0)\n",
+    "grouped = (\n",
+    "    df\n",
+    "    .groupby([\"latitude\", \"longitude\"])\n",
+    "    .size()\n",
+    "    .reset_index()\n",
+    "    .drop(columns=0)\n",
+    ")\n",
     "\n",
     "# Display unique latitude and longitude pairs in a scrollable table\n",
     "unique_pairs = grouped[[\"latitude\", \"longitude\"]]\n",