Sorry i got a question too. Glad someone ask this question.
With regards to
And tref is the temperature that equates to ISA+31, ie at Sea level it is 15+31=46
Plays out that if the flex is less than this temperature then you go for a TOGA takeoff
So does it mean that if I go TOGA thrust take off, it's the SAME thrust as if i'm doing a flex 46 take off?