FROM TH2F
constant
0.01615363360388633+-0.015764435925484366
chi2/ndof = 0.005155582713579413
plane
0.004658482333469593+-0.0371734420221732
invpt slope = 0.01381275304313792+-0.024262072141745673
theta slope = 0.00021905800837453832+-0.053358254617795954
chi2/ndof = 9.863858743044627e-05
from tgraph2D
constant
0.018174589959387144+-0.0012010229377143898
chi2/ndof = 0.00011539648775435447
plane
0.0049499813842358445+-0.0004010153363301352
invpt slope = 0.013345003902036651+-0.00023665179793531146
theta slope = 0.0009414444324691146+-0.000599682355103274
chi2/ndof = 2.7714233778988983e-06