diff --git a/module3/exo3/exercice_python_en.org b/module3/exo3/exercice_python_en.org
index 2fe11f562a165228048815dbd220bd0e0a69a75a..834456fb6c50ab58e73c9d975e4f731a47711386 100644
--- a/module3/exo3/exercice_python_en.org
+++ b/module3/exo3/exercice_python_en.org
@@ -20,6 +20,15 @@ py.init_notebook_mode(connected=True)
 co2data = pd.read_csv("module3/exo3/monthly_in_situ_co2_mlo.csv")
 co2data.head(11)
 
+grp1 = co2data.groupby(["Year"]).mean()["Carbon Dioxide (ppm)"]
+trace1 = go.Bar(x=grp1.index, y=grp1.values)
+layout = go.Layout(
+    title="Average CO<sub>2</sub> Levels in Atmosphere per month",
+    yaxis=dict(title="Parts per million (PPM)", range=(300,420)),
+    xaxis=dict(title="Year"))
+figure = go.Figure(data=[trace1], layout=layout)
+py.iplot(figure, filename="co2-ppm-year")
+
 Finally, an example for graphical output:
 #+begin_src python :results output file :session :var matplot_lib_filename="./cosxsx.png" :exports results
 import matplotlib.pyplot as plt