Did you just reply to my ventured plot pun with one of your own? I think I get it....

Sorry about the low-quality pun in an above comment; I couldn't think of anything funny to say about "ordinate" and "abscissa" (something with abscess, perhaps), so I went with "coordinate." It wasn't terribly droll, but I had to say something to disguise my utter failure to solve the challenge posed.