FROM TH2F
constant
0.021130013758133247+-0.01749948809756008
chi2/ndof = 0.018103866516737958
plane
-8.919154133212297e-06+-0.039828845409223296
invpt slope = 0.030176387100069292+-0.02899847101000575
theta slope = -0.0015436664412781576+-0.05760111231612677
chi2/ndof = 0.002211673042110264
from tgraph2D
constant
0.032968674412938236+-0.003076617786490373
chi2/ndof = 0.0007951084683540628
plane
0.0017958175610481965+-0.0023909459544315197
invpt slope = 0.03182579058841327+-0.0013651182678912626
theta slope = -0.0024740982177542453+-0.0035529914797989308
chi2/ndof = 0.00010443178751454819