FROM TH2F
constant
0.017890164719453084+-0.018035401913762614
chi2/ndof = 0.006730953121705064
plane
0.01252985672663922+-0.11541953169673685
invpt slope = 0.0007537793000775793+-0.012212701499310969
theta slope = 0.003148465953537804+-0.09372868074158446
chi2/ndof = 0.006889652992591611
from tgraph2D
constant
0.023421618027253163+-0.0015629230486844334
chi2/ndof = 0.00014656370736560636
plane
0.028376431340180003+-0.010667111474560847
invpt slope = 0.003910422635941957+-0.0009581087498302232
theta slope = -0.010480119117658816+-0.00863418087057594
chi2/ndof = 0.00011567807750733584