added cell with dataet download

Author: pierinim

RTA_Workshop/ECAL_laser.ipynb

@@ -12,6 +12,18 @@
     "The input dataset consists of ROOT files with plain TTrees. Each file corresponds to a single crystal."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "# download the dataset\n",
+    "! wget https://github.com/pierinim/tutorials/blob/master/RTA_Workshop/data.tar.gz?raw=true -O \"data.tar.gz\"\n",
+    "! tar -xzf data.tar.gz\n",
+    "! ls"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 1,