Hardcoding the file extension to be `'.xvg.all_data_450micro'` is also not optimal. Maybe there is a way to make this a little bit more configurable? If not, it's best to declare these global variables up at the top of the file or something so that if someone else wanted to change them, they can easily find out why their file (with a slightly different ending) isn't being read and change the code to accommodate their stuff.