FROM TH2F
constant
15.025280961422185+-0.35533486317702573
chi2/ndof = 26.27585403667318
plane
28.518418604678086+-2.0096073526517277
invpt slope = -7.309659394361712+-0.20599128518895746
theta slope = 23.802510126306046+-1.6349161382266482
chi2/ndof = 14.189792108369776
from tgraph2D
constant
41.21559859157492+-2.571331390738993
chi2/ndof = 819.8563954480817
plane
88.84806687225588+-12.681489713166302
invpt slope = -7.473420314872351+-1.0008853990932125
theta slope = -18.813109346077+-10.989836204295171
chi2/ndof = 557.6392899002461