FROM TH2F
constant
0.02962690234300423+-0.01912496343760645
chi2/ndof = 0.0040804541663216395
plane
0.035415729449977874+-0.13220961750206786
invpt slope = 0.0049992176036437455+-0.012079284133472399
theta slope = -0.015371638711304656+-0.11024183319376242
chi2/ndof = 0.0016844297485239033
from tgraph2D
constant
0.032731190060195946+-0.0012765637082621838
chi2/ndof = 0.00013851726660791354
plane
0.04124124034339114+-0.005266942078470284
invpt slope = 0.005296067231610322+-0.00047570566789888094
theta slope = -0.019906877066470294+-0.004520180482135783
chi2/ndof = 5.2972887633903215e-05