FROM TH2F
constant
17.97045403900106+-0.3621756443588428
chi2/ndof = 20.616566979276406
plane
2.1196245936667797+-0.9098849850662056
invpt slope = 4.122067287298115+-0.314934206213538
theta slope = 14.313574132424378+-1.2630419015261423
chi2/ndof = 18.219660850463704
from tgraph2D
constant
35.8453751021145+-3.9920285008471685
chi2/ndof = 2438.2526046733096
plane
-17.482249093545477+-7.478187918271819
invpt slope = 16.781015400958967+-2.0695269288817872
theta slope = 29.806766994024127+-10.35427045390783
chi2/ndof = 1570.181631809976