Having been told I had today and tomorrow to work on my pretty little graphs, it became evident this morning that I only had today. Spent ages converting data into useable form, hunting data I didn't have, and vaguifying the second graph by the cunning expedients of averaging and smooth lines. Unbelievably, I have managed to produce something serviceable, and have thus completed the entirety of my quest in time.
It's just like if I was on Knightmare and got to the end of level 3, having managed to pick everything correctly and not starve. Hooray!
(btw: Anybody else remember Knightmare? Or what?)
Off to the pub now. Mr. Enthusiastic is going to drop by.