FROM TH2F
constant
0.04954671724343858+-0.01623411125440691
chi2/ndof = 0.011505189921348951
plane
0.016454257588471955+-0.03929033760287334
invpt slope = 0.014265174438026766+-0.010274471172068667
theta slope = 0.005089942691514502+-0.04497196914124739
chi2/ndof = 0.0009674005444654588
from tgraph2D
constant
0.05772563101202279+-0.001960452546023192
chi2/ndof = 0.0007917350824146762
plane
0.016644850809140455+-0.0013072742100865235
invpt slope = 0.014784243366997822+-0.0003014757554894398
theta slope = 0.004867822882607234+-0.001493369848035394
chi2/ndof = 5.992145049715777e-05