FROM TH2F
constant
0.025894522263476844+-0.023726027840604975
chi2/ndof = 0.005134743554028663
plane
0.042490516041692+-0.14396155970839164
invpt slope = 0.006656909295815869+-0.030144245609133154
theta slope = -0.023689964339768537+-0.11109294417270661
chi2/ndof = 0.0024124747021319367
from tgraph2D
constant
0.029674253705390657+-0.0017943728456224573
chi2/ndof = 0.0001577689215470947
plane
0.059362570114501675+-0.005454806392302319
invpt slope = 0.0058911477618732305+-0.0011568590568629931
theta slope = -0.036381929231306745+-0.00441350048164026
chi2/ndof = 4.758594599456181e-05