FROM TH2F
constant
0.024923704545428017+-0.01860544444891836
chi2/ndof = 0.010265841378094581
plane
0.0030197729036100336+-0.07367599651926811
invpt slope = 0.0014115832832300745+-0.014806530229441034
theta slope = 0.020492315160115404+-0.05460837148113662
chi2/ndof = 0.008424051587609963
from tgraph2D
constant
0.03460273996672612+-0.0019009889650384512
chi2/ndof = 0.00028548696456320974
plane
0.025425137778116433+-0.008565835295987501
invpt slope = 0.002993026163042498+-0.0012321730184070066
theta slope = 0.0032808218633326933+-0.007580833881747692
chi2/ndof = 0.0002717704896614964