FROM TH2F
constant
21.03419546153127+-0.7251585257580386
chi2/ndof = 12.581173960698912
plane
26.019121653137468+-1.6529454147874927
invpt slope = 1.9860752735982732+-1.3370624094705144
theta slope = -14.502957487827318+-2.836569012431348
chi2/ndof = 12.554255008000956
from tgraph2D
constant
27.968645144415074+-2.5336244818231983
chi2/ndof = 340.2204099330742
plane
12.783301117391265+-4.179626647551707
invpt slope = 17.35467685915637+-3.2532738825654475
theta slope = 8.959306871505362+-7.892462741375424
chi2/ndof = 219.53630483360567