FROM TH2F
constant
0.006549182764830146+-0.006500214767292926
chi2/ndof = 0.0033631149615583216
plane
0.0016142606806610767+-0.01506114170475533
invpt slope = 0.0031985899090781083+-0.004902455703924387
theta slope = -0.00035808266591337714+-0.017732667065785343
chi2/ndof = 0.0006065474788391861
from tgraph2D
constant
0.009176473046529396+-0.0004013073470517276
chi2/ndof = 2.7700184929403783e-05
plane
0.001330599526775965+-0.0003252644929310391
invpt slope = 0.003022064659037131+-8.604421998548656e-05
theta slope = 0.0018043301434197737+-0.00040231549948114464
chi2/ndof = 3.188004634346979e-06