Possible corruption or regression of GWdata.ipynb

[emiliom]

In @JBBeaulieu 's most recent PR (#12), she inadvertently included changes to the notebook GWdata.ipynb that are not deliberate. There's a possibility that her version was older than the version on the master branch here, and led to a regression.

This is just a heads-up to be on the lookout for this potential problem. Based on the history of commits on this file, I see that @nina-aragon created it originally and last modified it. So, @nina-aragon, next time you open that notebook, give it a good lookover to make sure it doesn't have unexpected changes.