FROM TH2F
constant
0.02528400330334174+-0.020033306912245523
chi2/ndof = 0.0031203068496642125
plane
0.024777351448780408+-0.15671271754845964
invpt slope = 0.0020971526786831398+-0.0141917523556792
theta slope = -0.0034177562141880415+-0.13478704569863784
chi2/ndof = 0.0028595435894779937
from tgraph2D
constant
0.026988124891430865+-0.0011732179403626346
chi2/ndof = 9.359794282026132e-05
plane
0.03583540215834417+-0.007186605163364805
invpt slope = 0.0037095339881443724+-0.0006623285434324073
theta slope = -0.014386732427679853+-0.006281858606278774
chi2/ndof = 6.421908916164473e-05