The change point is 28 (like the boiling point of water). 27.9 is blue; 28.01 is green. Someone convinced me that numbers are probably shown truncated, not rounded. However, I have the feeling the code may be doing both now, depending on where you look. So, the underlying numbers are right, but the on-screen representation may not be. That's the best explanation I've got.
Oh...in short, 100. Also, was Galt the architect or the other one?