diff --git a/notebooks/IPinverse.ipynb b/notebooks/IPinverse.ipynb
index 5c3ad95a..56e000d4 100644
--- a/notebooks/IPinverse.ipynb
+++ b/notebooks/IPinverse.ipynb
@@ -85,7 +85,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 31,
    "metadata": {
     "collapsed": false
    },
@@ -101,7 +101,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 32,
    "metadata": {
     "collapsed": false
    },
@@ -113,7 +113,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 33,
    "metadata": {
     "collapsed": false
    },
@@ -125,7 +125,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 34,
    "metadata": {
     "collapsed": false
    },
@@ -136,7 +136,7 @@
        "(-600.0, 600.0, -600.0, 0.0)"
       ]
      },
-     "execution_count": 8,
+     "execution_count": 34,
      "metadata": {},
      "output_type": "execute_result"
     },
@@ -144,7 +144,7 @@
      "data": {
       "image/png": 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O6OnXBNH/A8wG7i4n2/yD7cttb5N0K7AN2A9c3pC5Lwc+ARxPcfX5sEQfETHTqsyzt71f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\n",
       "text/plain": [
-       "<matplotlib.figure.Figure at 0x1076887d0>"
+       "<matplotlib.figure.Figure at 0x10986eb90>"
       ]
      },
      "metadata": {},
@@ -159,7 +159,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 35,
    "metadata": {
     "collapsed": false
    },
@@ -174,7 +174,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 36,
    "metadata": {
     "collapsed": false
    },
@@ -193,6 +193,72 @@
     "print len(survey.srcList)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 40,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "DATA = Survey.Data(survey)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 42,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "tx0 = srcList[0]"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 55,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'c5f9fd3e-9e73-4561-b2c2-52a2747439e8'"
+      ]
+     },
+     "execution_count": 55,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "tx0.uid"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 37,
+   "metadata": {
+    "collapsed": true
+   },
+   "outputs": [],
+   "source": [
+    "import SimPEG"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 39,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [],
+   "source": [
+    "SimPEG.Survey.Data??"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 11,