FROM TH2F
constant
0.01658257450026076+-0.02146222424363111
chi2/ndof = 0.003926501623788295
plane
0.005752885550597765+-0.05191859904397126
invpt slope = 0.017737125298125975+-0.0492113076856899
theta slope = 0.0005901720294976265+-0.08754917240367827
chi2/ndof = 0.00022739129504745993
from tgraph2D
constant
0.016462697620603307+-0.001404992239517697
chi2/ndof = 9.672615646194852e-05
plane
0.005893208070458798+-0.0006715612903874581
invpt slope = 0.016789399223085658+-0.0005972875847219428
theta slope = 0.002049460480613051+-0.0012608705965041437
chi2/ndof = 5.46277202633726e-06