FROM TH2F
constant
0.022588451692041434+-0.017963634570345523
chi2/ndof = 0.011790586001368607
plane
-0.0258298849463055+-0.09829582048709654
invpt slope = 0.005586591084655886+-0.014375954559399405
theta slope = 0.03337750618800406+-0.08240495982390361
chi2/ndof = 0.007307808946660645
from tgraph2D
constant
0.03253187955677088+-0.0019952027624023753
chi2/ndof = 0.00030254338878771324
plane
0.013826612041762748+-0.010365819538798745
invpt slope = 0.007769937072444237+-0.0009629635721920911
theta slope = 0.002045453990398304+-0.008527852927135603
chi2/ndof = 0.00016265385729101378