in reply to Hints on hoq to create this graph?

The closing code tag must be "</code>" and because you read -- at least in part - the instructions on how to format a question, you do get some (IMHO) useful advice:

Non-specific questions that make no effort to show that you've actually worked at coming up with an answer -- even if that work has failed -- are apt to get only generic answers... like:

Come, let us reason together: Spirit of the Monastery