FROM TH2F
constant
0.018587323894528423+-0.021292002337315333
chi2/ndof = 0.024310607636982895
plane
-0.002076387648667702+-0.05004542795648982
invpt slope = 0.03575153771533823+-0.04784458376509117
theta slope = 0.003747575991643135+-0.08351439801072627
chi2/ndof = 0.010872112012583111
from tgraph2D
constant
0.03352274865790341+-0.005291125291092742
chi2/ndof = 0.0015117843695585927
plane
-0.01145514350015052+-0.006241632663604695
invpt slope = 0.04338622297314416+-0.005196355810530901
theta slope = 0.03682886697996366+-0.011247429319024256
chi2/ndof = 0.0005602254203964317