FROM TH2F
constant
12.00128477161998+-0.4201065124683823
chi2/ndof = 44.855476030136735
plane
8.738389145587417+-3.4784028563738585
invpt slope = -18.23278255154227+-0.4500592592205121
theta slope = 58.788663865046715+-3.5472735014922923
chi2/ndof = 20.750816259855924
from tgraph2D
constant
59.25772043608522+-4.382365049765613
chi2/ndof = 1459.5893774626516
plane
-21.286559151492582+-14.755486255313278
invpt slope = -17.19449140609455+-2.0690623978583518
theta slope = 104.34612105414945+-13.87617262909269
chi2/ndof = 583.8916082680059