FROM TH2F
constant
26.957072069357782+-0.5115849352918024
chi2/ndof = 28.922129488257188
plane
28.105717445479502+-1.111773814654867
invpt slope = -7.305311566850961+-0.4722584423839567
theta slope = 23.420202392051916+-1.8610090465280855
chi2/ndof = 26.84024486110564
from tgraph2D
constant
51.54873479158942+-4.63934586959666
chi2/ndof = 2561.300081376908
plane
2.879569793675792+-8.548492447159134
invpt slope = 20.605521874193734+-3.4323281367374308
theta slope = 29.980842509236023+-11.821547775623726
chi2/ndof = 1796.4496980903043