Update etraction command

README.md

@@ -34,9 +34,9 @@ To revert the process into files and directories follow these steps:
 $ git clone https://huggingface.co/datasets/links-ads/wildfires-cems
 $ cd wildfires-ems
 # revert the multipart compression: merge first, then untar
-$ cat data/train/train.tar.* | tar -xvf - -i
-$ cat data/test/test.tar.* | tar -xvf - -i
-$ cat data/val/val.tar.* | tar -xvf - -i
+$ cat data/train/train.tar.* | tar -xzvf - -i
+$ cat data/test/test.tar.* | tar -xzvf - -i
+$ cat data/val/val.tar.* | tar -xzvf - -i
 ```
 
 It is very likely that the extracted files will retain the internal directory structure, making the `train/val/test` directories useless.