Now, I'm oversimplifying a lot here. I'm sure that the data patterns are nowhere near this cut and dry. Most likely the trendlines are curved, although I don't think they're as curved as the line you came up with.
The yellow area covers all the way from 3/4" steel to 1/4" quarry tiles.
If you look at the vast amount of play between materials, material thickness and temperatures, you'll see why it bothers me a bit when people talk temps. I'm in no way saying this is you, but beginners have a tendency to fall under the assumption that if another member bakes their pizza at 550, they can make the same pizza at 550. Which is why I try to get people to focus as much as possible on bake times. There's nothing relative about bake times. 5 minutes for Joe is 5 minutes for Larry. Sure, there might be subjectivity in how much color/char Joe or Larry prefers, but it's not like Joe is trying to achieve a 5 minute bake with quarry tiles at 550 because Larry is getting a 5 minute bake at 550 with steel. John Q Neapolitan Pizzamaker may not have the insulation that you have under your hearth (or may have more), but if he can tweak his temps to match your 60 second bake, he can make your pizza (along with, of course, matching your dough and everything else).
I'm sure you're getting something from this data, but, for me personally, if I could get 10 people with the same stone (composition and thickness) baking for different times at different temps, that data would be invaluable.