N.B. Plot plain-text data file(s) with multiple columns. Two modes are available, Single File Mode and Multiple Files Mode.
N.B. In the Single File Mode, only one file button is available. Select a file to plot all columns.
N.B. In Multiple Files Mode, use the '# of Folders' dropdown to navigate between folders and select multiple files in each folder.
N.B. In both modes, the input for number of header lines is optional. However, in case of failure, you still need to input a value.
