FROM TH2F
constant
13.457739233019948+-0.4235994842256452
chi2/ndof = 30.704330518394055
plane
43.50794806202751+-1.2477833334424562
invpt slope = -9.466754994546294+-0.5730589638532038
theta slope = -10.98046689574792+-1.7310137461925972
chi2/ndof = 19.756672655121132
from tgraph2D
constant
39.071690172577725+-2.915571458740123
chi2/ndof = 782.0512386428218
plane
33.82818884180019+-5.958805153791507
invpt slope = 6.165387974923481+-3.5779439118319987
theta slope = -1.1678096109597593+-7.940683581394044
chi2/ndof = 772.733131972221