FROM TH2F
constant
3.3313825468275398+-0.2299545346467571
chi2/ndof = 1.976861512787524
plane
5.007638364011683+-1.2288195018325394
invpt slope = -1.2036056877688681+-0.2144844091783421
theta slope = 0.8758046361423097+-1.0427963726963627
chi2/ndof = 1.4785469254103694
from tgraph2D
constant
5.264959749432249+-0.1968405873485017
chi2/ndof = 2.7122351751158758
plane
6.8526982959635285+-1.0967713354141677
invpt slope = -0.3905607236709712+-0.17663247203146273
theta slope = -0.9525191478250163+-0.9798645727186233
chi2/ndof = 2.5804283227337472