diff --git a/Pulsar/Pulsar search with epoch folding and Z squared.ipynb b/Pulsar/Pulsar search with epoch folding and Z squared.ipynb
index 9f8ed18..bee24a6 100644
--- a/Pulsar/Pulsar search with epoch folding and Z squared.ipynb	
+++ b/Pulsar/Pulsar search with epoch folding and Z squared.ipynb	
@@ -572,7 +572,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -668,7 +668,7 @@
     "        sfdot.reset()\n",
     "        spepoch.reset()\n",
     "        pcolor.set_array(phas.T.ravel())\n",
-    "        l.set_xdata(1)\n",
+    "        l.set_xdata(np.full_like(biny, 1))\n",
     "\n",
     "    button.on_clicked(reset)\n",
     "\n",
@@ -727,7 +727,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 17,
+   "execution_count": null,
    "metadata": {
     "collapsed": true
    },
@@ -840,9 +840,9 @@
     "        self.sfdot.reset()\n",
     "        self.spepoch.reset()\n",
     "        self.pcolor.set_array(self.phaseogr.T.ravel())\n",
-    "        self.l1.set_xdata(0.5)\n",
-    "        self.l2.set_xdata(1)\n",
-    "        self.l3.set_xdata(1.5)\n",
+    "        self.l1.set_xdata(0.5) #issue expects array\n",
+    "        self.l2.set_xdata(1) #issue expects array\n",
+    "        self.l3.set_xdata(1.5) #issue expects array\n",
     "    \n",
     "    def get_values(self):\n",
     "        return self.freq, self.fdot"
diff --git a/requirements.txt b/requirements.txt
index ca7f2f4..1c9e588 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ scipy
 matplotlib
 emcee
 corner
+seaborn
 -e git+https://github.com/StingraySoftware/stingray.git#egg=stingray