FROM TH2F
constant
24.861466673655205+-0.7051449027524302
chi2/ndof = 15.66942595844471
plane
125.58589574373248+-5.5533499359173195
invpt slope = -5.234936069597693+-0.6345155008893862
theta slope = -74.55603169153821+-4.428884304253469
chi2/ndof = 8.808919732456891
from tgraph2D
constant
38.931675315518774+-2.7777637110348277
chi2/ndof = 432.0943890108845
plane
144.73869935012053+-14.410775277253043
invpt slope = 0.1052306664097588+-1.8276180393322778
theta slope = -93.21797067608989+-12.620869900187385
chi2/ndof = 219.51777950641412