FROM TH2F
constant
12.556727306085126+-0.44294341016651617
chi2/ndof = 33.61844433778041
plane
16.668458245632742+-2.023294909340815
invpt slope = -1.8860180716964845+-0.1696974481072819
theta slope = 1.856949750886045+-1.9373645580792678
chi2/ndof = 32.4778523548212
from tgraph2D
constant
49.55116282958775+-3.672583098742832
chi2/ndof = 957.6385271776415
plane
-27.530820319900847+-14.802378589225922
invpt slope = -8.852025898214848+-1.3363431898755855
theta slope = 87.90708079611014+-14.124404303814071
chi2/ndof = 504.14316012572004