We may have multiple graphs on a job's main page coming from different plugins. Most of them have a title (usually at the top of the picture) but the TAP test results graph doesn't have one.
See attached screenshot: as you can see, there may be confusion looking at the graphs, because the title of the second graph "CheckTcl" seems to refer to the first graph (which is coming from TAP).

The best would be to have an option to specify a title for the TAP graph.