FROM TH2F
constant
0.04211534381134893+-0.01922063579573952
chi2/ndof = 0.01953667347492913
plane
0.018413680664793784+-0.04170334699290938
invpt slope = 0.018166402978944184+-0.017807186998387372
theta slope = -0.0030164088133681176+-0.058858181352987156
chi2/ndof = 0.009757682304744329
from tgraph2D
constant
0.0560564079172501+-0.00313522837638909
chi2/ndof = 0.001277855406282246
plane
0.013784982773123535+-0.0034229530442637717
invpt slope = 0.02340590354517886+-0.0013196830613150445
theta slope = 0.0035248932887432475+-0.004884222347854423
chi2/ndof = 0.00032347889833030916