FROM TH2F
constant
22.52608211631986+-0.6027635565307351
chi2/ndof = 33.43741693781559
plane
48.548680158481936+-4.744463295539143
invpt slope = -2.5923774422569394+-0.4466099267662851
theta slope = -16.55696424098333+-4.63779979651665
chi2/ndof = 32.3441304841402
from tgraph2D
constant
54.56086194622729+-3.7043543693044154
chi2/ndof = 905.6679239222964
plane
114.96634469978392+-19.360045274193705
invpt slope = 3.9336462448347524+-2.724467944004097
theta slope = -60.57266974093447+-16.861548292419965
chi2/ndof = 764.9576144031307