FROM TH2F
constant
0.01599385200876928+-0.01422862687635977
chi2/ndof = 0.007682180835509727
plane
0.017712183076833053+-0.0873084117025882
invpt slope = 0.002003004103693668+-0.010794797544914051
theta slope = -0.005532951579802781+-0.06820290402910231
chi2/ndof = 0.006993883741201796
from tgraph2D
constant
0.022473041869268347+-0.0009170913531506991
chi2/ndof = 7.148980675173611e-05
plane
0.02720265004688568+-0.004811541418219715
invpt slope = 0.002765330022902834+-0.0005067276336253385
theta slope = -0.010485687503754317+-0.004281969251944226
chi2/ndof = 4.9451841680943825e-05