diff --git a/module3/exo1/analyse-syndrome-grippal.ipynb b/module3/exo1/analyse-syndrome-grippal.ipynb
index 4cb677cba7e35569c2467d8905be29731451f226..6eec130a4abbdc0e9b07584fc9b7b6d331b5fb28 100644
--- a/module3/exo1/analyse-syndrome-grippal.ipynb
+++ b/module3/exo1/analyse-syndrome-grippal.ipynb
@@ -59,18 +59,21 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [],
    "source": [
     "raw_data = pd.read_csv(data_url, skiprows=1)\n",
     "raw_data\n",
     "file = '/home/jovyan/work/module3/exo1/incidence-PAY-3.csv'\n",
+    "# check existing local copy\n",
     "try:\n",
     "    local_data = pd.read_csv(file)\n",
+    "# if no local copy, create it\n",
     "except FileNotFoundError:\n",
     "    raw_data.to_csv('incidence-PAY-3.csv')\n",
-    "rax_data = pd.read_csv('incidence-PAY-3.csv')"
+    "# read local copy\n",
+    "raw_data = pd.read_csv('incidence-PAY-3.csv')"
    ]
   },
   {
@@ -82,7 +85,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 12,
    "metadata": {},
    "outputs": [
     {
@@ -106,6 +109,7 @@
        "  <thead>\n",
        "    <tr style=\"text-align: right;\">\n",
        "      <th></th>\n",
+       "      <th>Unnamed: 0</th>\n",
        "      <th>week</th>\n",
        "      <th>indicator</th>\n",
        "      <th>inc</th>\n",
@@ -121,6 +125,7 @@
        "  <tbody>\n",
        "    <tr>\n",
        "      <th>1656</th>\n",
+       "      <td>1656</td>\n",
        "      <td>198919</td>\n",
        "      <td>3</td>\n",
        "      <td>0</td>\n",
@@ -137,14 +142,14 @@
        "</div>"
       ],
       "text/plain": [
-       "        week  indicator  inc  inc_low  inc_up  inc100  inc100_low  inc100_up  \\\n",
-       "1656  198919          3    0      NaN     NaN       0         NaN        NaN   \n",
+       "      Unnamed: 0    week  indicator  inc  inc_low  inc_up  inc100  inc100_low  \\\n",
+       "1656        1656  198919          3    0      NaN     NaN       0         NaN   \n",
        "\n",
-       "     geo_insee geo_name  \n",
-       "1656        FR   France  "
+       "      inc100_up geo_insee geo_name  \n",
+       "1656        NaN        FR   France  "
       ]
      },
-     "execution_count": 4,
+     "execution_count": 12,
      "metadata": {},
      "output_type": "execute_result"
     }