FROM TH2F
constant
14.061946927358225+-0.2522473374620922
chi2/ndof = 6.092966164106896
plane
23.847451011569134+-0.7719804897755146
invpt slope = -0.8875614943806205+-0.12969956643956385
theta slope = -8.505375044743342+-0.7565450301594248
chi2/ndof = 5.313519118737065
from tgraph2D
constant
19.91778382053652+-1.3822557033852116
chi2/ndof = 456.6407684542425
plane
19.752876292001105+-3.3397929530750803
invpt slope = 2.1453804999193333+-0.6274144217562666
theta slope = -9.414862331927058+-3.8327556830939664
chi2/ndof = 431.7120307629673