FROM TH2F
constant
44.36691844799951+-0.7904974224341594
chi2/ndof = 12.328646251719787
plane
8.998204296451497+-4.354510653201809
invpt slope = 6.540497406006873+-0.7576114682045304
theta slope = 22.98531183718608+-3.9581673379985585
chi2/ndof = 11.021519250873478
from tgraph2D
constant
53.8500859719172+-3.4909382305352286
chi2/ndof = 938.3720282285193
plane
29.443218685087864+-15.03757935991651
invpt slope = 14.171494433551118+-2.496127871866555
theta slope = -0.13490430468334935+-13.875604076187628
chi2/ndof = 664.8156234304668