FROM TH2F
constant
3.009869473640029+-0.22979279263151797
chi2/ndof = 10.435505030207834
plane
-12.119718072233432+-2.64933175243115
invpt slope = -2.3512832698316686+-0.1540627244614212
theta slope = 24.642194072298754+-2.443301346977489
chi2/ndof = 4.670624722329941
from tgraph2D
constant
13.821707233703114+-1.0988452861019427
chi2/ndof = 74.86257970368794
plane
38.30634685353345+-8.998823754635206
invpt slope = -2.7738225463845123+-0.45128005160993084
theta slope = -15.559416578305708+-7.816748958552521
chi2/ndof = 46.34634620266162