diff --git a/module3/exo3/exercice.ipynb b/module3/exo3/exercice.ipynb
index 0736082893cd821aa9fcd5a268c02ca92eb062cb..0ac49333db3bb8e80fc09d414554d10aef5841a8 100644
--- a/module3/exo3/exercice.ipynb
+++ b/module3/exo3/exercice.ipynb
@@ -9,7 +9,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 109,
+   "execution_count": 135,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -22,7 +22,8 @@
     "from IPython.core.interactiveshell import InteractiveShell\n",
     "InteractiveShell.ast_node_interactivity = \"last_expr\"    \n",
     "# ‘all’|’last’|’last_expr’|’none’\n",
-    "#https://jupyter-console.readthedocs.io/en/4.0.1/config_options.html"
+    "#https://jupyter-console.readthedocs.io/en/4.0.1/config_options.html\n",
+    "pd.options.display.max_rows = 10"
    ]
   },
   {
@@ -34,9 +35,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 110,
+   "execution_count": 136,
    "metadata": {},
    "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(756, 10)\n"
+     ]
+    },
     {
      "data": {
       "text/html": [
@@ -156,7 +164,7 @@
        "4     315.06        317.51       314.71  "
       ]
      },
-     "execution_count": 110,
+     "execution_count": 136,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -175,6 +183,7 @@
     "else:\n",
     "    raw_data.to_csv('monthly_in_situ_co2_mlo',index=True)\n",
     "\n",
+    "print(raw_data.shape)\n",
     "raw_data.head()"
    ]
   },
@@ -187,7 +196,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 111,
+   "execution_count": 137,
    "metadata": {},
    "outputs": [
     {
@@ -208,7 +217,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 112,
+   "execution_count": 138,
    "metadata": {},
    "outputs": [
     {
@@ -323,7 +332,7 @@
        "4  1958   5   21320  1958.3699  317.51  314.71  317.86  315.06  317.51  314.71"
       ]
      },
-     "execution_count": 112,
+     "execution_count": 138,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -341,7 +350,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 113,
+   "execution_count": 139,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -384,7 +393,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 114,
+   "execution_count": 140,
    "metadata": {},
    "outputs": [
     {
@@ -499,7 +508,7 @@
        "75  1964   4   23482  1964.2896 NaN NaN  321.83  319.45  321.83  319.45"
       ]
      },
-     "execution_count": 114,
+     "execution_count": 140,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -510,7 +519,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 115,
+   "execution_count": 141,
    "metadata": {},
    "outputs": [
     {
@@ -625,7 +634,7 @@
        "6  1958   7   21381  1958.5370  315.86  315.19  315.86  315.22  315.86  315.19"
       ]
      },
-     "execution_count": 115,
+     "execution_count": 141,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -644,11 +653,18 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 117,
+   "execution_count": 146,
    "metadata": {
     "scrolled": true
    },
    "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(745, 11)\n"
+     ]
+    },
     {
      "data": {
       "text/html": [
@@ -680,15 +696,43 @@
        "      <th>s4</th>\n",
        "      <th>s5</th>\n",
        "      <th>s6</th>\n",
-       "      <th>period</th>\n",
+       "      <th>0</th>\n",
        "    </tr>\n",
        "  </thead>\n",
        "  <tbody>\n",
        "    <tr>\n",
+       "      <th>0</th>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1958-03-01</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
+       "      <th>1</th>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>NaN</td>\n",
+       "      <td>1958-04-01</td>\n",
+       "    </tr>\n",
+       "    <tr>\n",
        "      <th>2</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>3</td>\n",
-       "      <td>21259</td>\n",
+       "      <td>1958.0</td>\n",
+       "      <td>3.0</td>\n",
+       "      <td>21259.0</td>\n",
        "      <td>1958.2027</td>\n",
        "      <td>315.70</td>\n",
        "      <td>314.44</td>\n",
@@ -700,9 +744,9 @@
        "    </tr>\n",
        "    <tr>\n",
        "      <th>3</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>4</td>\n",
-       "      <td>21290</td>\n",
+       "      <td>1958.0</td>\n",
+       "      <td>4.0</td>\n",
+       "      <td>21290.0</td>\n",
        "      <td>1958.2877</td>\n",
        "      <td>317.45</td>\n",
        "      <td>315.16</td>\n",
@@ -714,9 +758,9 @@
        "    </tr>\n",
        "    <tr>\n",
        "      <th>4</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>5</td>\n",
-       "      <td>21320</td>\n",
+       "      <td>1958.0</td>\n",
+       "      <td>5.0</td>\n",
+       "      <td>21320.0</td>\n",
        "      <td>1958.3699</td>\n",
        "      <td>317.51</td>\n",
        "      <td>314.71</td>\n",
@@ -727,965 +771,140 @@
        "      <td>1958-08-01</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>6</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>7</td>\n",
-       "      <td>21381</td>\n",
-       "      <td>1958.5370</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>315.19</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>315.22</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>315.19</td>\n",
-       "      <td>1958-11-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>7</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>8</td>\n",
-       "      <td>21412</td>\n",
-       "      <td>1958.6219</td>\n",
-       "      <td>314.93</td>\n",
-       "      <td>316.19</td>\n",
-       "      <td>314.00</td>\n",
-       "      <td>315.29</td>\n",
-       "      <td>314.93</td>\n",
-       "      <td>316.19</td>\n",
-       "      <td>1958-12-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>8</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>9</td>\n",
-       "      <td>21443</td>\n",
-       "      <td>1958.7068</td>\n",
-       "      <td>313.21</td>\n",
-       "      <td>316.08</td>\n",
-       "      <td>312.46</td>\n",
-       "      <td>315.35</td>\n",
-       "      <td>313.21</td>\n",
-       "      <td>316.08</td>\n",
-       "      <td>1959-01-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>10</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>11</td>\n",
-       "      <td>21504</td>\n",
-       "      <td>1958.8740</td>\n",
-       "      <td>313.33</td>\n",
-       "      <td>315.20</td>\n",
-       "      <td>313.62</td>\n",
-       "      <td>315.46</td>\n",
-       "      <td>313.33</td>\n",
-       "      <td>315.20</td>\n",
-       "      <td>1959-03-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>11</th>\n",
-       "      <td>1958</td>\n",
-       "      <td>12</td>\n",
-       "      <td>21534</td>\n",
-       "      <td>1958.9562</td>\n",
-       "      <td>314.67</td>\n",
-       "      <td>315.43</td>\n",
-       "      <td>314.77</td>\n",
-       "      <td>315.51</td>\n",
-       "      <td>314.67</td>\n",
-       "      <td>315.43</td>\n",
-       "      <td>1959-04-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>12</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>1</td>\n",
-       "      <td>21565</td>\n",
-       "      <td>1959.0411</td>\n",
-       "      <td>315.58</td>\n",
-       "      <td>315.54</td>\n",
-       "      <td>315.62</td>\n",
-       "      <td>315.57</td>\n",
-       "      <td>315.58</td>\n",
-       "      <td>315.54</td>\n",
-       "      <td>1959-05-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>13</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>2</td>\n",
-       "      <td>21596</td>\n",
-       "      <td>1959.1260</td>\n",
-       "      <td>316.49</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>316.27</td>\n",
-       "      <td>315.63</td>\n",
-       "      <td>316.49</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>1959-06-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>14</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>3</td>\n",
-       "      <td>21624</td>\n",
-       "      <td>1959.2027</td>\n",
-       "      <td>316.65</td>\n",
-       "      <td>315.38</td>\n",
-       "      <td>316.98</td>\n",
-       "      <td>315.69</td>\n",
-       "      <td>316.65</td>\n",
-       "      <td>315.38</td>\n",
-       "      <td>1959-07-01</td>\n",
+       "      <th>...</th>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
+       "      <td>...</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>15</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>4</td>\n",
-       "      <td>21655</td>\n",
-       "      <td>1959.2877</td>\n",
-       "      <td>317.72</td>\n",
-       "      <td>315.42</td>\n",
-       "      <td>318.09</td>\n",
-       "      <td>315.77</td>\n",
-       "      <td>317.72</td>\n",
-       "      <td>315.42</td>\n",
-       "      <td>1959-08-01</td>\n",
+       "      <th>740</th>\n",
+       "      <td>2019.0</td>\n",
+       "      <td>9.0</td>\n",
+       "      <td>43723.0</td>\n",
+       "      <td>2019.7068</td>\n",
+       "      <td>408.55</td>\n",
+       "      <td>412.06</td>\n",
+       "      <td>408.52</td>\n",
+       "      <td>412.05</td>\n",
+       "      <td>408.55</td>\n",
+       "      <td>412.06</td>\n",
+       "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>16</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>5</td>\n",
-       "      <td>21685</td>\n",
-       "      <td>1959.3699</td>\n",
-       "      <td>318.29</td>\n",
-       "      <td>315.49</td>\n",
-       "      <td>318.65</td>\n",
-       "      <td>315.85</td>\n",
-       "      <td>318.29</td>\n",
-       "      <td>315.49</td>\n",
-       "      <td>1959-09-01</td>\n",
+       "      <th>741</th>\n",
+       "      <td>2019.0</td>\n",
+       "      <td>10.0</td>\n",
+       "      <td>43753.0</td>\n",
+       "      <td>2019.7890</td>\n",
+       "      <td>408.43</td>\n",
+       "      <td>412.07</td>\n",
+       "      <td>408.67</td>\n",
+       "      <td>412.29</td>\n",
+       "      <td>408.43</td>\n",
+       "      <td>412.07</td>\n",
+       "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>17</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>6</td>\n",
-       "      <td>21716</td>\n",
-       "      <td>1959.4548</td>\n",
-       "      <td>318.15</td>\n",
-       "      <td>316.03</td>\n",
-       "      <td>318.04</td>\n",
-       "      <td>315.94</td>\n",
-       "      <td>318.15</td>\n",
-       "      <td>316.03</td>\n",
-       "      <td>1959-10-01</td>\n",
+       "      <th>742</th>\n",
+       "      <td>2019.0</td>\n",
+       "      <td>11.0</td>\n",
+       "      <td>43784.0</td>\n",
+       "      <td>2019.8740</td>\n",
+       "      <td>410.28</td>\n",
+       "      <td>412.56</td>\n",
+       "      <td>410.29</td>\n",
+       "      <td>412.54</td>\n",
+       "      <td>410.28</td>\n",
+       "      <td>412.56</td>\n",
+       "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>18</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>7</td>\n",
-       "      <td>21746</td>\n",
-       "      <td>1959.5370</td>\n",
-       "      <td>316.54</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>316.67</td>\n",
-       "      <td>316.03</td>\n",
-       "      <td>316.54</td>\n",
-       "      <td>315.86</td>\n",
-       "      <td>1959-11-01</td>\n",
+       "      <th>743</th>\n",
+       "      <td>2019.0</td>\n",
+       "      <td>12.0</td>\n",
+       "      <td>43814.0</td>\n",
+       "      <td>2019.9562</td>\n",
+       "      <td>411.85</td>\n",
+       "      <td>412.78</td>\n",
+       "      <td>411.88</td>\n",
+       "      <td>412.79</td>\n",
+       "      <td>411.85</td>\n",
+       "      <td>412.78</td>\n",
+       "      <td>NaN</td>\n",
        "    </tr>\n",
        "    <tr>\n",
-       "      <th>19</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>8</td>\n",
-       "      <td>21777</td>\n",
-       "      <td>1959.6219</td>\n",
-       "      <td>314.80</td>\n",
-       "      <td>316.06</td>\n",
-       "      <td>314.83</td>\n",
-       "      <td>316.12</td>\n",
-       "      <td>314.80</td>\n",
-       "      <td>316.06</td>\n",
-       "      <td>1959-12-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>20</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>9</td>\n",
-       "      <td>21808</td>\n",
-       "      <td>1959.7068</td>\n",
-       "      <td>313.84</td>\n",
-       "      <td>316.72</td>\n",
-       "      <td>313.32</td>\n",
-       "      <td>316.22</td>\n",
-       "      <td>313.84</td>\n",
-       "      <td>316.72</td>\n",
-       "      <td>1960-01-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>21</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>10</td>\n",
-       "      <td>21838</td>\n",
-       "      <td>1959.7890</td>\n",
-       "      <td>313.33</td>\n",
-       "      <td>316.32</td>\n",
-       "      <td>313.33</td>\n",
-       "      <td>316.30</td>\n",
-       "      <td>313.33</td>\n",
-       "      <td>316.32</td>\n",
-       "      <td>1960-02-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>22</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>11</td>\n",
-       "      <td>21869</td>\n",
-       "      <td>1959.8740</td>\n",
-       "      <td>314.81</td>\n",
-       "      <td>316.68</td>\n",
-       "      <td>314.54</td>\n",
-       "      <td>316.39</td>\n",
-       "      <td>314.81</td>\n",
-       "      <td>316.68</td>\n",
-       "      <td>1960-03-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>23</th>\n",
-       "      <td>1959</td>\n",
-       "      <td>12</td>\n",
-       "      <td>21899</td>\n",
-       "      <td>1959.9562</td>\n",
-       "      <td>315.58</td>\n",
-       "      <td>316.35</td>\n",
-       "      <td>315.72</td>\n",
-       "      <td>316.47</td>\n",
-       "      <td>315.58</td>\n",
-       "      <td>316.35</td>\n",
-       "      <td>1960-04-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>24</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>1</td>\n",
-       "      <td>21930</td>\n",
-       "      <td>1960.0410</td>\n",
-       "      <td>316.43</td>\n",
-       "      <td>316.39</td>\n",
-       "      <td>316.61</td>\n",
-       "      <td>316.56</td>\n",
-       "      <td>316.43</td>\n",
-       "      <td>316.39</td>\n",
-       "      <td>1960-05-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>25</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>2</td>\n",
-       "      <td>21961</td>\n",
-       "      <td>1960.1257</td>\n",
-       "      <td>316.98</td>\n",
-       "      <td>316.35</td>\n",
-       "      <td>317.27</td>\n",
-       "      <td>316.64</td>\n",
-       "      <td>316.98</td>\n",
-       "      <td>316.35</td>\n",
-       "      <td>1960-06-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>26</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>3</td>\n",
-       "      <td>21990</td>\n",
-       "      <td>1960.2049</td>\n",
-       "      <td>317.58</td>\n",
-       "      <td>316.28</td>\n",
-       "      <td>318.03</td>\n",
-       "      <td>316.71</td>\n",
-       "      <td>317.58</td>\n",
-       "      <td>316.28</td>\n",
-       "      <td>1960-07-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>27</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>4</td>\n",
-       "      <td>22021</td>\n",
-       "      <td>1960.2896</td>\n",
-       "      <td>319.03</td>\n",
-       "      <td>316.70</td>\n",
-       "      <td>319.14</td>\n",
-       "      <td>316.79</td>\n",
-       "      <td>319.03</td>\n",
-       "      <td>316.70</td>\n",
-       "      <td>1960-08-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>28</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>5</td>\n",
-       "      <td>22051</td>\n",
-       "      <td>1960.3716</td>\n",
-       "      <td>320.04</td>\n",
-       "      <td>317.22</td>\n",
-       "      <td>319.67</td>\n",
-       "      <td>316.86</td>\n",
-       "      <td>320.04</td>\n",
-       "      <td>317.22</td>\n",
-       "      <td>1960-09-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>29</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>6</td>\n",
-       "      <td>22082</td>\n",
-       "      <td>1960.4563</td>\n",
-       "      <td>319.59</td>\n",
-       "      <td>317.48</td>\n",
-       "      <td>319.01</td>\n",
-       "      <td>316.93</td>\n",
-       "      <td>319.59</td>\n",
-       "      <td>317.48</td>\n",
-       "      <td>1960-10-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>30</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>7</td>\n",
-       "      <td>22112</td>\n",
-       "      <td>1960.5383</td>\n",
-       "      <td>318.18</td>\n",
-       "      <td>317.53</td>\n",
-       "      <td>317.60</td>\n",
-       "      <td>316.98</td>\n",
-       "      <td>318.18</td>\n",
-       "      <td>317.53</td>\n",
-       "      <td>1960-11-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>31</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>8</td>\n",
-       "      <td>22143</td>\n",
-       "      <td>1960.6230</td>\n",
-       "      <td>315.90</td>\n",
-       "      <td>317.20</td>\n",
-       "      <td>315.69</td>\n",
-       "      <td>317.01</td>\n",
-       "      <td>315.90</td>\n",
-       "      <td>317.20</td>\n",
-       "      <td>1960-12-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>32</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>9</td>\n",
-       "      <td>22174</td>\n",
-       "      <td>1960.7077</td>\n",
-       "      <td>314.17</td>\n",
-       "      <td>317.07</td>\n",
-       "      <td>314.12</td>\n",
-       "      <td>317.04</td>\n",
-       "      <td>314.17</td>\n",
-       "      <td>317.07</td>\n",
-       "      <td>1961-01-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>33</th>\n",
-       "      <td>1960</td>\n",
-       "      <td>10</td>\n",
-       "      <td>22204</td>\n",
-       "      <td>1960.7896</td>\n",
-       "      <td>313.83</td>\n",
-       "      <td>316.83</td>\n",
-       "      <td>314.09</td>\n",
-       "      <td>317.07</td>\n",
-       "      <td>313.83</td>\n",
-       "      <td>316.83</td>\n",
-       "      <td>1961-02-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>...</th>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "      <td>...</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>715</th>\n",
-       "      <td>2017</td>\n",
-       "      <td>8</td>\n",
-       "      <td>42962</td>\n",
-       "      <td>2017.6219</td>\n",
-       "      <td>405.24</td>\n",
-       "      <td>406.77</td>\n",
-       "      <td>405.20</td>\n",
-       "      <td>406.76</td>\n",
-       "      <td>405.24</td>\n",
-       "      <td>406.77</td>\n",
-       "      <td>2018-03-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>716</th>\n",
-       "      <td>2017</td>\n",
-       "      <td>9</td>\n",
-       "      <td>42993</td>\n",
-       "      <td>2017.7068</td>\n",
-       "      <td>403.27</td>\n",
-       "      <td>406.76</td>\n",
-       "      <td>403.41</td>\n",
-       "      <td>406.92</td>\n",
-       "      <td>403.27</td>\n",
-       "      <td>406.76</td>\n",
-       "      <td>2018-04-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>717</th>\n",
-       "      <td>2017</td>\n",
-       "      <td>10</td>\n",
-       "      <td>43023</td>\n",
-       "      <td>2017.7890</td>\n",
-       "      <td>403.64</td>\n",
-       "      <td>407.25</td>\n",
-       "      <td>403.47</td>\n",
-       "      <td>407.07</td>\n",
-       "      <td>403.64</td>\n",
-       "      <td>407.25</td>\n",
-       "      <td>2018-05-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>718</th>\n",
-       "      <td>2017</td>\n",
-       "      <td>11</td>\n",
-       "      <td>43054</td>\n",
-       "      <td>2017.8740</td>\n",
-       "      <td>405.17</td>\n",
-       "      <td>407.43</td>\n",
-       "      <td>404.98</td>\n",
-       "      <td>407.22</td>\n",
-       "      <td>405.17</td>\n",
-       "      <td>407.43</td>\n",
-       "      <td>2018-06-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>719</th>\n",
-       "      <td>2017</td>\n",
-       "      <td>12</td>\n",
-       "      <td>43084</td>\n",
-       "      <td>2017.9562</td>\n",
-       "      <td>406.75</td>\n",
-       "      <td>407.68</td>\n",
-       "      <td>406.46</td>\n",
-       "      <td>407.37</td>\n",
-       "      <td>406.75</td>\n",
-       "      <td>407.68</td>\n",
-       "      <td>2018-07-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>720</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>1</td>\n",
-       "      <td>43115</td>\n",
-       "      <td>2018.0411</td>\n",
-       "      <td>408.05</td>\n",
-       "      <td>408.00</td>\n",
-       "      <td>407.58</td>\n",
-       "      <td>407.52</td>\n",
-       "      <td>408.05</td>\n",
-       "      <td>408.00</td>\n",
-       "      <td>2018-08-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>721</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>2</td>\n",
-       "      <td>43146</td>\n",
-       "      <td>2018.1260</td>\n",
-       "      <td>408.34</td>\n",
-       "      <td>407.59</td>\n",
-       "      <td>408.44</td>\n",
-       "      <td>407.68</td>\n",
-       "      <td>408.34</td>\n",
-       "      <td>407.59</td>\n",
-       "      <td>2018-09-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>722</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>3</td>\n",
-       "      <td>43174</td>\n",
-       "      <td>2018.2027</td>\n",
-       "      <td>409.25</td>\n",
-       "      <td>407.71</td>\n",
-       "      <td>409.39</td>\n",
-       "      <td>407.82</td>\n",
-       "      <td>409.25</td>\n",
-       "      <td>407.71</td>\n",
-       "      <td>2018-10-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>723</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>4</td>\n",
-       "      <td>43205</td>\n",
-       "      <td>2018.2877</td>\n",
-       "      <td>410.30</td>\n",
-       "      <td>407.51</td>\n",
-       "      <td>410.82</td>\n",
-       "      <td>408.00</td>\n",
-       "      <td>410.30</td>\n",
-       "      <td>407.51</td>\n",
-       "      <td>2018-11-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>724</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>5</td>\n",
-       "      <td>43235</td>\n",
-       "      <td>2018.3699</td>\n",
-       "      <td>411.30</td>\n",
-       "      <td>407.90</td>\n",
-       "      <td>411.60</td>\n",
-       "      <td>408.20</td>\n",
-       "      <td>411.30</td>\n",
-       "      <td>407.90</td>\n",
-       "      <td>2018-12-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>725</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>6</td>\n",
-       "      <td>43266</td>\n",
-       "      <td>2018.4548</td>\n",
-       "      <td>410.88</td>\n",
-       "      <td>408.30</td>\n",
-       "      <td>410.97</td>\n",
-       "      <td>408.42</td>\n",
-       "      <td>410.88</td>\n",
-       "      <td>408.30</td>\n",
-       "      <td>2019-01-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>726</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>7</td>\n",
-       "      <td>43296</td>\n",
-       "      <td>2018.5370</td>\n",
-       "      <td>408.90</td>\n",
-       "      <td>408.08</td>\n",
-       "      <td>409.43</td>\n",
-       "      <td>408.65</td>\n",
-       "      <td>408.90</td>\n",
-       "      <td>408.08</td>\n",
-       "      <td>2019-02-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>727</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>8</td>\n",
-       "      <td>43327</td>\n",
-       "      <td>2018.6219</td>\n",
-       "      <td>407.10</td>\n",
-       "      <td>408.63</td>\n",
-       "      <td>407.33</td>\n",
-       "      <td>408.91</td>\n",
-       "      <td>407.10</td>\n",
-       "      <td>408.63</td>\n",
-       "      <td>2019-03-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>728</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>9</td>\n",
-       "      <td>43358</td>\n",
-       "      <td>2018.7068</td>\n",
-       "      <td>405.59</td>\n",
-       "      <td>409.09</td>\n",
-       "      <td>405.66</td>\n",
-       "      <td>409.18</td>\n",
-       "      <td>405.59</td>\n",
-       "      <td>409.09</td>\n",
-       "      <td>2019-04-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>729</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>10</td>\n",
-       "      <td>43388</td>\n",
-       "      <td>2018.7890</td>\n",
-       "      <td>405.99</td>\n",
-       "      <td>409.62</td>\n",
-       "      <td>405.83</td>\n",
-       "      <td>409.44</td>\n",
-       "      <td>405.99</td>\n",
-       "      <td>409.62</td>\n",
-       "      <td>2019-05-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>730</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>11</td>\n",
-       "      <td>43419</td>\n",
-       "      <td>2018.8740</td>\n",
-       "      <td>408.12</td>\n",
-       "      <td>410.39</td>\n",
-       "      <td>407.47</td>\n",
-       "      <td>409.72</td>\n",
-       "      <td>408.12</td>\n",
-       "      <td>410.39</td>\n",
-       "      <td>2019-06-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>731</th>\n",
-       "      <td>2018</td>\n",
-       "      <td>12</td>\n",
-       "      <td>43449</td>\n",
-       "      <td>2018.9562</td>\n",
-       "      <td>409.23</td>\n",
-       "      <td>410.16</td>\n",
-       "      <td>409.07</td>\n",
-       "      <td>409.97</td>\n",
-       "      <td>409.23</td>\n",
-       "      <td>410.16</td>\n",
-       "      <td>2019-07-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>732</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>1</td>\n",
-       "      <td>43480</td>\n",
-       "      <td>2019.0411</td>\n",
-       "      <td>410.92</td>\n",
-       "      <td>410.87</td>\n",
-       "      <td>410.29</td>\n",
-       "      <td>410.23</td>\n",
-       "      <td>410.92</td>\n",
-       "      <td>410.87</td>\n",
-       "      <td>2019-08-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>733</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>2</td>\n",
-       "      <td>43511</td>\n",
-       "      <td>2019.1260</td>\n",
-       "      <td>411.66</td>\n",
-       "      <td>410.90</td>\n",
-       "      <td>411.24</td>\n",
-       "      <td>410.47</td>\n",
-       "      <td>411.66</td>\n",
-       "      <td>410.90</td>\n",
-       "      <td>2019-09-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>734</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>3</td>\n",
-       "      <td>43539</td>\n",
-       "      <td>2019.2027</td>\n",
-       "      <td>412.00</td>\n",
-       "      <td>410.45</td>\n",
-       "      <td>412.25</td>\n",
-       "      <td>410.68</td>\n",
-       "      <td>412.00</td>\n",
-       "      <td>410.45</td>\n",
-       "      <td>2019-10-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>735</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>4</td>\n",
-       "      <td>43570</td>\n",
-       "      <td>2019.2877</td>\n",
-       "      <td>413.52</td>\n",
-       "      <td>410.72</td>\n",
-       "      <td>413.73</td>\n",
-       "      <td>410.91</td>\n",
-       "      <td>413.52</td>\n",
-       "      <td>410.72</td>\n",
-       "      <td>2019-11-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>736</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>5</td>\n",
-       "      <td>43600</td>\n",
-       "      <td>2019.3699</td>\n",
-       "      <td>414.83</td>\n",
-       "      <td>411.42</td>\n",
-       "      <td>414.54</td>\n",
-       "      <td>411.13</td>\n",
-       "      <td>414.83</td>\n",
-       "      <td>411.42</td>\n",
-       "      <td>2019-12-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>737</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>6</td>\n",
-       "      <td>43631</td>\n",
-       "      <td>2019.4548</td>\n",
-       "      <td>413.96</td>\n",
-       "      <td>411.38</td>\n",
-       "      <td>413.91</td>\n",
-       "      <td>411.35</td>\n",
-       "      <td>413.96</td>\n",
-       "      <td>411.38</td>\n",
-       "      <td>2020-01-01</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>738</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>7</td>\n",
-       "      <td>43661</td>\n",
-       "      <td>2019.5370</td>\n",
-       "      <td>411.85</td>\n",
-       "      <td>411.03</td>\n",
-       "      <td>412.36</td>\n",
-       "      <td>411.57</td>\n",
-       "      <td>411.85</td>\n",
-       "      <td>411.03</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>739</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>8</td>\n",
-       "      <td>43692</td>\n",
-       "      <td>2019.6219</td>\n",
-       "      <td>410.08</td>\n",
-       "      <td>411.62</td>\n",
-       "      <td>410.23</td>\n",
-       "      <td>411.81</td>\n",
-       "      <td>410.08</td>\n",
-       "      <td>411.62</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>740</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>9</td>\n",
-       "      <td>43723</td>\n",
-       "      <td>2019.7068</td>\n",
-       "      <td>408.55</td>\n",
-       "      <td>412.06</td>\n",
-       "      <td>408.52</td>\n",
-       "      <td>412.05</td>\n",
-       "      <td>408.55</td>\n",
-       "      <td>412.06</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>741</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>10</td>\n",
-       "      <td>43753</td>\n",
-       "      <td>2019.7890</td>\n",
-       "      <td>408.43</td>\n",
-       "      <td>412.07</td>\n",
-       "      <td>408.67</td>\n",
-       "      <td>412.29</td>\n",
-       "      <td>408.43</td>\n",
-       "      <td>412.07</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>742</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>11</td>\n",
-       "      <td>43784</td>\n",
-       "      <td>2019.8740</td>\n",
-       "      <td>410.28</td>\n",
-       "      <td>412.56</td>\n",
-       "      <td>410.29</td>\n",
-       "      <td>412.54</td>\n",
-       "      <td>410.28</td>\n",
-       "      <td>412.56</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>743</th>\n",
-       "      <td>2019</td>\n",
-       "      <td>12</td>\n",
-       "      <td>43814</td>\n",
-       "      <td>2019.9562</td>\n",
-       "      <td>411.85</td>\n",
-       "      <td>412.78</td>\n",
-       "      <td>411.88</td>\n",
-       "      <td>412.79</td>\n",
-       "      <td>411.85</td>\n",
-       "      <td>412.78</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>744</th>\n",
-       "      <td>2020</td>\n",
-       "      <td>1</td>\n",
-       "      <td>43845</td>\n",
-       "      <td>2020.0410</td>\n",
-       "      <td>413.37</td>\n",
-       "      <td>413.33</td>\n",
-       "      <td>413.11</td>\n",
-       "      <td>413.05</td>\n",
-       "      <td>413.37</td>\n",
-       "      <td>413.33</td>\n",
-       "      <td>NaN</td>\n",
+       "      <th>744</th>\n",
+       "      <td>2020.0</td>\n",
+       "      <td>1.0</td>\n",
+       "      <td>43845.0</td>\n",
+       "      <td>2020.0410</td>\n",
+       "      <td>413.37</td>\n",
+       "      <td>413.33</td>\n",
+       "      <td>413.11</td>\n",
+       "      <td>413.05</td>\n",
+       "      <td>413.37</td>\n",
+       "      <td>413.33</td>\n",
+       "      <td>NaN</td>\n",
        "    </tr>\n",
        "  </tbody>\n",
        "</table>\n",
-       "<p>738 rows × 11 columns</p>\n",
+       "<p>745 rows × 11 columns</p>\n",
        "</div>"
       ],
       "text/plain": [
-       "       Yr  Mn  Date 1     Date 2      s1      s2      s3      s4      s5  \\\n",
-       "2    1958   3   21259  1958.2027  315.70  314.44  316.19  314.91  315.70   \n",
-       "3    1958   4   21290  1958.2877  317.45  315.16  317.30  314.99  317.45   \n",
-       "4    1958   5   21320  1958.3699  317.51  314.71  317.86  315.06  317.51   \n",
-       "6    1958   7   21381  1958.5370  315.86  315.19  315.86  315.22  315.86   \n",
-       "7    1958   8   21412  1958.6219  314.93  316.19  314.00  315.29  314.93   \n",
-       "8    1958   9   21443  1958.7068  313.21  316.08  312.46  315.35  313.21   \n",
-       "10   1958  11   21504  1958.8740  313.33  315.20  313.62  315.46  313.33   \n",
-       "11   1958  12   21534  1958.9562  314.67  315.43  314.77  315.51  314.67   \n",
-       "12   1959   1   21565  1959.0411  315.58  315.54  315.62  315.57  315.58   \n",
-       "13   1959   2   21596  1959.1260  316.49  315.86  316.27  315.63  316.49   \n",
-       "14   1959   3   21624  1959.2027  316.65  315.38  316.98  315.69  316.65   \n",
-       "15   1959   4   21655  1959.2877  317.72  315.42  318.09  315.77  317.72   \n",
-       "16   1959   5   21685  1959.3699  318.29  315.49  318.65  315.85  318.29   \n",
-       "17   1959   6   21716  1959.4548  318.15  316.03  318.04  315.94  318.15   \n",
-       "18   1959   7   21746  1959.5370  316.54  315.86  316.67  316.03  316.54   \n",
-       "19   1959   8   21777  1959.6219  314.80  316.06  314.83  316.12  314.80   \n",
-       "20   1959   9   21808  1959.7068  313.84  316.72  313.32  316.22  313.84   \n",
-       "21   1959  10   21838  1959.7890  313.33  316.32  313.33  316.30  313.33   \n",
-       "22   1959  11   21869  1959.8740  314.81  316.68  314.54  316.39  314.81   \n",
-       "23   1959  12   21899  1959.9562  315.58  316.35  315.72  316.47  315.58   \n",
-       "24   1960   1   21930  1960.0410  316.43  316.39  316.61  316.56  316.43   \n",
-       "25   1960   2   21961  1960.1257  316.98  316.35  317.27  316.64  316.98   \n",
-       "26   1960   3   21990  1960.2049  317.58  316.28  318.03  316.71  317.58   \n",
-       "27   1960   4   22021  1960.2896  319.03  316.70  319.14  316.79  319.03   \n",
-       "28   1960   5   22051  1960.3716  320.04  317.22  319.67  316.86  320.04   \n",
-       "29   1960   6   22082  1960.4563  319.59  317.48  319.01  316.93  319.59   \n",
-       "30   1960   7   22112  1960.5383  318.18  317.53  317.60  316.98  318.18   \n",
-       "31   1960   8   22143  1960.6230  315.90  317.20  315.69  317.01  315.90   \n",
-       "32   1960   9   22174  1960.7077  314.17  317.07  314.12  317.04  314.17   \n",
-       "33   1960  10   22204  1960.7896  313.83  316.83  314.09  317.07  313.83   \n",
-       "..    ...  ..     ...        ...     ...     ...     ...     ...     ...   \n",
-       "715  2017   8   42962  2017.6219  405.24  406.77  405.20  406.76  405.24   \n",
-       "716  2017   9   42993  2017.7068  403.27  406.76  403.41  406.92  403.27   \n",
-       "717  2017  10   43023  2017.7890  403.64  407.25  403.47  407.07  403.64   \n",
-       "718  2017  11   43054  2017.8740  405.17  407.43  404.98  407.22  405.17   \n",
-       "719  2017  12   43084  2017.9562  406.75  407.68  406.46  407.37  406.75   \n",
-       "720  2018   1   43115  2018.0411  408.05  408.00  407.58  407.52  408.05   \n",
-       "721  2018   2   43146  2018.1260  408.34  407.59  408.44  407.68  408.34   \n",
-       "722  2018   3   43174  2018.2027  409.25  407.71  409.39  407.82  409.25   \n",
-       "723  2018   4   43205  2018.2877  410.30  407.51  410.82  408.00  410.30   \n",
-       "724  2018   5   43235  2018.3699  411.30  407.90  411.60  408.20  411.30   \n",
-       "725  2018   6   43266  2018.4548  410.88  408.30  410.97  408.42  410.88   \n",
-       "726  2018   7   43296  2018.5370  408.90  408.08  409.43  408.65  408.90   \n",
-       "727  2018   8   43327  2018.6219  407.10  408.63  407.33  408.91  407.10   \n",
-       "728  2018   9   43358  2018.7068  405.59  409.09  405.66  409.18  405.59   \n",
-       "729  2018  10   43388  2018.7890  405.99  409.62  405.83  409.44  405.99   \n",
-       "730  2018  11   43419  2018.8740  408.12  410.39  407.47  409.72  408.12   \n",
-       "731  2018  12   43449  2018.9562  409.23  410.16  409.07  409.97  409.23   \n",
-       "732  2019   1   43480  2019.0411  410.92  410.87  410.29  410.23  410.92   \n",
-       "733  2019   2   43511  2019.1260  411.66  410.90  411.24  410.47  411.66   \n",
-       "734  2019   3   43539  2019.2027  412.00  410.45  412.25  410.68  412.00   \n",
-       "735  2019   4   43570  2019.2877  413.52  410.72  413.73  410.91  413.52   \n",
-       "736  2019   5   43600  2019.3699  414.83  411.42  414.54  411.13  414.83   \n",
-       "737  2019   6   43631  2019.4548  413.96  411.38  413.91  411.35  413.96   \n",
-       "738  2019   7   43661  2019.5370  411.85  411.03  412.36  411.57  411.85   \n",
-       "739  2019   8   43692  2019.6219  410.08  411.62  410.23  411.81  410.08   \n",
-       "740  2019   9   43723  2019.7068  408.55  412.06  408.52  412.05  408.55   \n",
-       "741  2019  10   43753  2019.7890  408.43  412.07  408.67  412.29  408.43   \n",
-       "742  2019  11   43784  2019.8740  410.28  412.56  410.29  412.54  410.28   \n",
-       "743  2019  12   43814  2019.9562  411.85  412.78  411.88  412.79  411.85   \n",
-       "744  2020   1   43845  2020.0410  413.37  413.33  413.11  413.05  413.37   \n",
+       "         Yr    Mn   Date 1     Date 2      s1      s2      s3      s4      s5  \\\n",
+       "0       NaN   NaN      NaN        NaN     NaN     NaN     NaN     NaN     NaN   \n",
+       "1       NaN   NaN      NaN        NaN     NaN     NaN     NaN     NaN     NaN   \n",
+       "2    1958.0   3.0  21259.0  1958.2027  315.70  314.44  316.19  314.91  315.70   \n",
+       "3    1958.0   4.0  21290.0  1958.2877  317.45  315.16  317.30  314.99  317.45   \n",
+       "4    1958.0   5.0  21320.0  1958.3699  317.51  314.71  317.86  315.06  317.51   \n",
+       "..      ...   ...      ...        ...     ...     ...     ...     ...     ...   \n",
+       "740  2019.0   9.0  43723.0  2019.7068  408.55  412.06  408.52  412.05  408.55   \n",
+       "741  2019.0  10.0  43753.0  2019.7890  408.43  412.07  408.67  412.29  408.43   \n",
+       "742  2019.0  11.0  43784.0  2019.8740  410.28  412.56  410.29  412.54  410.28   \n",
+       "743  2019.0  12.0  43814.0  2019.9562  411.85  412.78  411.88  412.79  411.85   \n",
+       "744  2020.0   1.0  43845.0  2020.0410  413.37  413.33  413.11  413.05  413.37   \n",
        "\n",
-       "         s6      period  \n",
+       "         s6           0  \n",
+       "0       NaN  1958-03-01  \n",
+       "1       NaN  1958-04-01  \n",
        "2    314.44  1958-05-01  \n",
        "3    315.16  1958-07-01  \n",
        "4    314.71  1958-08-01  \n",
-       "6    315.19  1958-11-01  \n",
-       "7    316.19  1958-12-01  \n",
-       "8    316.08  1959-01-01  \n",
-       "10   315.20  1959-03-01  \n",
-       "11   315.43  1959-04-01  \n",
-       "12   315.54  1959-05-01  \n",
-       "13   315.86  1959-06-01  \n",
-       "14   315.38  1959-07-01  \n",
-       "15   315.42  1959-08-01  \n",
-       "16   315.49  1959-09-01  \n",
-       "17   316.03  1959-10-01  \n",
-       "18   315.86  1959-11-01  \n",
-       "19   316.06  1959-12-01  \n",
-       "20   316.72  1960-01-01  \n",
-       "21   316.32  1960-02-01  \n",
-       "22   316.68  1960-03-01  \n",
-       "23   316.35  1960-04-01  \n",
-       "24   316.39  1960-05-01  \n",
-       "25   316.35  1960-06-01  \n",
-       "26   316.28  1960-07-01  \n",
-       "27   316.70  1960-08-01  \n",
-       "28   317.22  1960-09-01  \n",
-       "29   317.48  1960-10-01  \n",
-       "30   317.53  1960-11-01  \n",
-       "31   317.20  1960-12-01  \n",
-       "32   317.07  1961-01-01  \n",
-       "33   316.83  1961-02-01  \n",
        "..      ...         ...  \n",
-       "715  406.77  2018-03-01  \n",
-       "716  406.76  2018-04-01  \n",
-       "717  407.25  2018-05-01  \n",
-       "718  407.43  2018-06-01  \n",
-       "719  407.68  2018-07-01  \n",
-       "720  408.00  2018-08-01  \n",
-       "721  407.59  2018-09-01  \n",
-       "722  407.71  2018-10-01  \n",
-       "723  407.51  2018-11-01  \n",
-       "724  407.90  2018-12-01  \n",
-       "725  408.30  2019-01-01  \n",
-       "726  408.08  2019-02-01  \n",
-       "727  408.63  2019-03-01  \n",
-       "728  409.09  2019-04-01  \n",
-       "729  409.62  2019-05-01  \n",
-       "730  410.39  2019-06-01  \n",
-       "731  410.16  2019-07-01  \n",
-       "732  410.87  2019-08-01  \n",
-       "733  410.90  2019-09-01  \n",
-       "734  410.45  2019-10-01  \n",
-       "735  410.72  2019-11-01  \n",
-       "736  411.42  2019-12-01  \n",
-       "737  411.38  2020-01-01  \n",
-       "738  411.03         NaN  \n",
-       "739  411.62         NaN  \n",
        "740  412.06         NaN  \n",
        "741  412.07         NaN  \n",
        "742  412.56         NaN  \n",
        "743  412.78         NaN  \n",
        "744  413.33         NaN  \n",
        "\n",
-       "[738 rows x 11 columns]"
+       "[745 rows x 11 columns]"
       ]
      },
-     "execution_count": 117,
+     "execution_count": 146,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
     "data = data.dropna().copy()\n",
-    "data\n",
-    "\n",
-    "data['period'] = pd.Series([datetime.date(y,m,1) for y,m in zip(data['Yr'],data['Mn'])])\n",
+    "period = [datetime.date(y,m,1) for y,m in zip(data['Yr'],data['Mn'])]\n",
+    "period = pd.Series(period)\n",
+    "newdf = pd.concat([data,period],axis=1)\n",
+    "print(newdf.shape)\n",
+    "#data['period'] = pd.Series([datetime.date(y,m,1) for y,m in zip(data['Yr'],data['Mn'])])\n",
     "\n",
     "#data1 = data1.set_index('period')   \n",
-    "data"
+    "#data\n",
+    "newdf"
    ]
   },
   {