FROM TH2F
constant
12.114655755212086+-0.44203809046199044
chi2/ndof = 12.065042625508825
plane
23.3009860667525+-1.0713187122285919
invpt slope = -6.730198362394363+-0.6800773605290308
theta slope = -2.495204126086148+-1.6346918542046414
chi2/ndof = 9.571721049254181
from tgraph2D
constant
21.579343218789454+-1.5967838230479294
chi2/ndof = 198.87804905563857
plane
6.4007419398177605+-2.71320148548094
invpt slope = 8.927150818211027+-1.8328193872022023
theta slope = 14.605371447630231+-3.7554110431935475
chi2/ndof = 129.29005327336208