diff --git a/book/docs/notebooks/Experiment4.ipynb b/book/docs/notebooks/Experiment4.ipynb
index 9bac5b85..aba6862a 100644
--- a/book/docs/notebooks/Experiment4.ipynb
+++ b/book/docs/notebooks/Experiment4.ipynb
@@ -27,9 +27,7 @@
     "from cvx.simulator import FuturesPortfolio\n",
     "from cvx.simulator import interpolate\n",
     "\n",
-    "from tinycta.signal import *\n",
-    "\n",
-    "pd.options.plotting.backend = \"plotly\""
+    "from tinycta.signal import *\n"
    ]
   },
   {