The second graph links to datawrapper.de. The shades of blue appear to be the default palette in that application. It wasn't a stylistic choice "blue because fi

The second graph links to datawrapper.de. The shades of blue appear to be the default palette in that application. It wasn't a stylistic choice "blue because fish". I tried one of datawrapper's sample data sets, "Gender pay gap" and added a couple of extra columns. The resulting line graph has four shades of blue. https://datawrapper.dwcdn.net/g98Jd/1/ https://datawrapper.dwcdn.net/g98Jd/1/ (There are "base color" and "customize colors" buttons so the author could have changed this. Seems like a nice little app).