diff --git a/README.md b/README.md
index 07b760fa6bcc92e129c37a2205026b34f34a716c..d17848afce8f340a6dbee875c7d3e2e21d649a4c 100644
--- a/README.md
+++ b/README.md
@@ -64,4 +64,5 @@ Non functional (expected values are $`5.085`$ and $`-0.1156`$)
 | Python   |            3.6.4 | statsmodels 0.9.0 numpy 1.15.2 pandas 0.22.0 matplotlib 2.2.3 | Jupyter | Linux Ubuntu 4.4.0-164-generic | Identical                                | Identical                                 | Identical                    | Identical | Identical    | [ipynb] (https://app-learninglab.inria.fr/moocrr/gitlab/d3ffe1dda057aedb6d37daa14d4dce86/mooc-rr/blob/master/module4/src_Python3_challenger.ipynb), [pdf] (https://app-learninglab.inria.fr/moocrr/gitlab/d3ffe1dda057aedb6d37daa14d4dce86/mooc-rr/blob/master/module4/src_Python3_challenger.pdf) |  d3ffe1dda057aedb6d37daa14d4dce86 | 
 | R        |            3.6.3 | ggplot2 3.3.0                                                 | RStudio | Windows 10 x64 (build 18363)   | Identical                                | Identical                                 | Identical                    | Identical | Identical    | [Rmd] (https://app-learninglab.inria.fr/moocrr/gitlab/3e3d09557efde0d973c3f246d977cc35/mooc-rr/blob/master/module4/Gullstrand_src_R_challenger.Rmd)| https:// 3e3d09557efde0d973c3f246d977cc35 |
 | R        |            3.5.1 | ggplot2 3.3.0                                                 | RStudio | Windows 10 x64 (build 18363)   | Identical                                | Identical                                 | Identical                    | Identical | Identical    | [Rmd](https://app-learninglab.inria.fr/moocrr/gitlab/525f77b1f86b1bcc7fc77168921eb737/mooc-rr/blob/master/challenger.Rmd) [html](https://app-learninglab.inria.fr/moocrr/gitlab/525f77b1f86b1bcc7fc77168921eb737/mooc-rr/blob/master/challenger.html) |
-| Python   |            3.7.1 | statsmodels 0.10.1 scipy 1.1.0 pandas 0.25.3 seaborn 0.9.0    | Jupyter | Windows 10 x64 (build 17134)   | Similar $`\hat{\alpha}=5.0850'$          | Identical                                 | Identical                    | Identical after code change | Identical after code change | [ipynb] (https://app-learninglab.inria.fr/moocrr/gitlab/65f0b71b8c107dc7c99fe00b869170e1/mooc-rr/blob/master/module4/src_Python3_challenger.ipynb), | 65f0b71b8c107dc7c99fe00b869170e1 |
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+| Python   |            3.7.1 | statsmodels 0.10.1 scipy 1.1.0 pandas 0.25.3 seaborn 0.9.0    | Jupyter | Windows 10 x64 (build 17134)   | Similar $`\hat{\alpha}=5.0850'$          | Identical                                 | Identical                    | Identical after code change | Identical after code change | [ipynb] (https://app-learninglab.inria.fr/moocrr/gitlab/65f0b71b8c107dc7c99fe00b869170e1/mooc-rr/blob/master/module4/src_Python3_challenger.ipynb), | 65f0b71b8c107dc7c99fe00b869170e1 |
+| Python   |            3.6.4 | statsmodels 0.9.0 scipy 1.1.0 pandas 0.22.0 seaborn 0.8.1     | Jupyter | Windows 10 x64 (build 18363)   | Identical                                | Identical                                 | Identical                    | Similar   | Similar       |  [ipynb](https://app-learninglab.inria.fr/moocrr/gitlab/de98852947736bd9e2f70971a6ed56d0/mooc-rr/blob/master/module4/ex4.ipynb) | de98852947736bd9e2f70971a6ed56d0 |
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