Free-text label for the overall graph

[Bandicoot]

The graphs it produces are great but once they're saved, unless you chase down the file and rename it then and there, exactly what it is a graph of becomes…unclear.

There should be a way to label a graph with a reasonable amount of free-form text, e.g. "Diamond SHR320A". Twenty to thirty characters should suffice and there's room at the top center.