FROM TH2F
constant
0.016379246002773944+-0.026124099667320846
chi2/ndof = 0.0035068423936603812
plane
0.013086214330679996+-0.3674579068497001
invpt slope = -0.003450425370052446+-0.03215525888512617
theta slope = 0.007129913636181032+-0.29005617496963876
chi2/ndof = 0.002990667109191378
from tgraph2D
constant
0.01941950997764738+-0.0009337038526574487
chi2/ndof = 2.4410480765094322e-05
plane
0.0390487045167533+-0.011923264499283999
invpt slope = 0.00013865184261334113+-0.001028175520179283
theta slope = -0.01650152590275892+-0.009681196379078699
chi2/ndof = 2.340681446897051e-05