FROM TH2F
constant
40.627570370924985+-0.610516177908249
chi2/ndof = 25.533898138385865
plane
26.76164967305056+-3.288591111552228
invpt slope = -7.624642873855925+-0.40754687653595656
theta slope = 35.034620106180014+-2.7538006483910964
chi2/ndof = 20.891081453145013
from tgraph2D
constant
64.33570560099477+-2.966843075184184
chi2/ndof = 1012.2481492856409
plane
62.16080559743006+-14.519525173377119
invpt slope = 3.5635103986619683+-1.881688730019473
theta slope = -5.912208597307917+-12.417618038153616
chi2/ndof = 997.3234419674037