FROM TH2F
constant
0.037668705603095196+-0.016403115053283224
chi2/ndof = 0.01484205003850963
plane
0.0619433040725854+-0.08136794853035853
invpt slope = 0.007432190453834907+-0.00801110458832993
theta slope = -0.037275464992213334+-0.07323287307801306
chi2/ndof = 0.008275401279682624
from tgraph2D
constant
0.05010742863959416+-0.002262537226422881
chi2/ndof = 0.0007576230556965385
plane
0.08045429706480264+-0.007510751142370508
invpt slope = 0.008791834859424726+-0.0007803992952587995
theta slope = -0.05117878601050819+-0.006898988493510771
chi2/ndof = 0.00038139095867381693