diff --git a/examples/Analysis-of-Immune-Response-Pneumocci.ipynb b/examples/Analysis-of-Immune-Response-Pneumocci.ipynb
index 89c535c..22ce4e4 100644
--- a/examples/Analysis-of-Immune-Response-Pneumocci.ipynb
+++ b/examples/Analysis-of-Immune-Response-Pneumocci.ipynb
@@ -449,6 +449,13 @@
     "<img src=\"https://github.com/ModelEngineering/controlSBML/raw/main/docs/images/pneumocci_design_output.png\" alt=\"drawing\" width=\"600\"/>\n"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "The dynamics are preserved when we change the set point."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 23,
diff --git a/examples/Analysis-of-mTOR.ipynb b/examples/Analysis-of-mTOR.ipynb
index 723abfa..10129e6 100644
--- a/examples/Analysis-of-mTOR.ipynb
+++ b/examples/Analysis-of-mTOR.ipynb
@@ -608,6 +608,49 @@
    "source": [
     "_ = CTLSB.plotDesign(kP_spec=CTLSB.kP, kI_spec=CTLSB.kI, setpoint=80)"
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "3efeb9bb-77d1-4d62-8b87-b592de66bb25",
+   "metadata": {},
+   "source": [
+    "# Effect of Noise"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "7cdae250-12cb-42c1-b2b4-6757b2f5e85b",
+   "metadata": {},
+   "outputs": [
+    {
+     "ename": "NameError",
+     "evalue": "name 'ControlSBML' is not defined",
+     "output_type": "error",
+     "traceback": [
+      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
+      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
+      "Cell \u001b[0;32mIn[1], line 1\u001b[0m\n\u001b[0;32m----> 1\u001b[0m ctlsb \u001b[38;5;241m=\u001b[39m \u001b[43mControlSBML\u001b[49m(URL, figsize\u001b[38;5;241m=\u001b[39m(\u001b[38;5;241m5\u001b[39m, \u001b[38;5;241m5\u001b[39m), times\u001b[38;5;241m=\u001b[39mnp\u001b[38;5;241m.\u001b[39mlinspace(\u001b[38;5;241m0\u001b[39m, \u001b[38;5;241m3000\u001b[39m, \u001b[38;5;241m30000\u001b[39m),\n\u001b[1;32m      2\u001b[0m                 markers\u001b[38;5;241m=\u001b[39m\u001b[38;5;28;01mFalse\u001b[39;00m, xlabel_angle\u001b[38;5;241m=\u001b[39m\u001b[38;5;241m45\u001b[39m,\n\u001b[1;32m      3\u001b[0m                 input_name\u001b[38;5;241m=\u001b[39mINPUT_NAME, output_name\u001b[38;5;241m=\u001b[39mOUTPUT_NAME)\n",
+      "\u001b[0;31mNameError\u001b[0m: name 'ControlSBML' is not defined"
+     ]
+    }
+   ],
+   "source": [
+    "%%time\n",
+    "noise_spec = ctl.NoiseSpec(random_mag=5, random_std=0.1, offset=1)\n",
+    "ctlsb = ControlSBML(URL, figsize=(5, 5), times=np.linspace(0, 3000, 30000),\n",
+    "                markers=False, xlabel_angle=45,\n",
+    "                input_name=INPUT_NAME, output_name=OUTPUT_NAME,\n",
+    "                   noise_spec=noise_spec)\n",
+    "grid = ctlsb.getGrid(kP_spec=True, kI_spec=True, num_coordinate=11)\n",
+    "axis = grid.getAxis(\"kP\", min)\n",
+    "axis.setMinValue(0.1)\n",
+    "axis.setMaxValue(2)\n",
+    "axis = GRID.getAxis(\"kI\")\n",
+    "axis.setMinValue(0.001)\n",
+    "axis.setMaxValue(0.01)\n",
+    "_ = ctlsb.plotGridDesign(GRID, setpoint=120,  times=np.linspace(0, 3000, 30000))"
+   ]
   }
  ],
  "metadata": {
diff --git a/src/controlSBML/sbml_system.py b/src/controlSBML/sbml_system.py
index b3d981a..da47008 100644
--- a/src/controlSBML/sbml_system.py
+++ b/src/controlSBML/sbml_system.py
@@ -543,7 +543,8 @@ def plotSISOClosedLoop(self, timeseries:Timeseries, setpoint, selections=None,
         df = pd.DataFrame(timeseries[columns], columns=columns)
         # Plot the other left axis lines
         if cn.O_LEGEND in new_kwargs.keys():
-            new_kwargs[cn.O_LEGEND].append(cn.O_SETPOINT)
+            if isinstance(new_kwargs[cn.O_LEGEND], list):
+                new_kwargs[cn.O_LEGEND].append(cn.O_SETPOINT)
         new_kwargs.setdefault(cn.O_AX2, 0)
         plot_result = util.plotOneTS(df, colors=colors, **new_kwargs)
         ax = plot_result.ax