FROM TH2F
constant
1.1912498347118388+-0.10651402034751706
chi2/ndof = 18.982832445541266
plane
-4.972299344469546+-0.5023590124020405
invpt slope = 0.4109189878044159+-0.09509199941104132
theta slope = 6.219625218019455+-0.5988221259639918
chi2/ndof = 17.658209352768196
from tgraph2D
constant
23.67247205165287+-4.334481179838642
chi2/ndof = 2292.102700143471
plane
-63.82764750664335+-14.555839397149295
invpt slope = 13.35213755964157+-1.3641863652746589
theta slope = 47.21221832481342+-12.782219836174734
chi2/ndof = 1177.4647728101277