FROM TH2F
constant
6.147642536621471+-0.38722409686391335
chi2/ndof = 19.326781396005902
plane
12.506447790732304+-2.018975337426864
invpt slope = -6.234632547814831+-0.672204190961996
theta slope = 4.506058637724577+-1.8717601877877414
chi2/ndof = 18.079407886967875
from tgraph2D
constant
31.07651306570339+-6.46802855079443
chi2/ndof = 1924.4280930826822
plane
-61.46526552663828+-32.61521474043805
invpt slope = -22.07707150788149+-5.666775914910316
theta slope = 117.0519348913605+-29.40767750055256
chi2/ndof = 1063.1459448996045