FROM TH2F
constant
0.02296377068422818+-0.01879597775871767
chi2/ndof = 0.0032155235483058947
plane
0.07365337595013993+-0.21783267584291957
invpt slope = -0.00066964943742083+-0.007969680939900041
theta slope = -0.03710675435971872+-0.16632873902138642
chi2/ndof = 0.002351777690794373
from tgraph2D
constant
0.02631863421193353+-0.0012863754200990872
chi2/ndof = 0.0001241071291101891
plane
0.06131842603592423+-0.013500562843144666
invpt slope = 0.0002806763526549441+-0.00044821437079274325
theta slope = -0.0277598356850223+-0.010710481823110577
chi2/ndof = 0.0001165779756706692