diff --git a/Notebooks/glm.ipynb b/Notebooks/glm.ipynb
index 975b6718ec2b71b5ed9eacc1424862446944f446..013bdfeeea583522bcc1d68d2717c15ace94a205 100644
--- a/Notebooks/glm.ipynb
+++ b/Notebooks/glm.ipynb
@@ -184,16 +184,6 @@
     "VALID_PERIOD = slice('1991-01-01', '2010-01-01')"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "cefcb0d1-e00e-4025-a872-b6da7e991876",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "VALID_PERIOD.stop"
-   ]
-  },
   {
    "cell_type": "code",
    "execution_count": null,