diff --git a/module3/exo1/influenza-like-illness-analysis.Rmd b/module3/exo1/influenza-like-illness-analysis.Rmd
index 8047fa03d3d3cc003416749dd44be6adbb072d04..0b894a6eaaaf3be7b46f40fb5dd0d04f41a4fcdc 100644
--- a/module3/exo1/influenza-like-illness-analysis.Rmd
+++ b/module3/exo1/influenza-like-illness-analysis.Rmd
@@ -22,9 +22,7 @@ knitr::opts_chunk$set(echo = TRUE)
 ## Data preprocessing
 
 The data on the incidence of influenza-like illness are available from the Web site of the [Réseau Sentinelles](http://www.sentiweb.fr/). We download them as a file in CSV format, in which each line corresponds to a week in the observation period. Only the complete dataset, starting in 1984 and ending with a recent week, is available for download. The URL is:
-```{r}
-data_url = "http://www.sentiweb.fr/datasets/incidence-PAY-3.csv"
-```
+
 
 This is the documentation of the data from [the download site](https://ns.sentiweb.fr/incidence/csv-schema-v1.json):
 
@@ -45,7 +43,7 @@ This is the documentation of the data from [the download site](https://ns.sentiw
 
 The first line of the CSV file is a comment, which we ignore with `skip=1`.
 ```{r}
-data = read.csv(data_url, skip=1)
+data = read.csv("incidence-PAY-3.csv", skip=1,na.strings = "-")
 ```
 
 Let's have a look at what we got: