FROM TH2F
constant
41.2230243552755+-0.8579775251724534
chi2/ndof = 40.7136493251804
plane
44.935926591873226+-4.848664323168364
invpt slope = -2.6240516268678027+-0.8352580643359544
theta slope = 0.4025175194945767+-4.66291795595369
chi2/ndof = 42.004508938592316
from tgraph2D
constant
80.46327986142629+-5.447707985280142
chi2/ndof = 1810.3288596599907
plane
84.99535624325829+-28.809680919239156
invpt slope = 5.282579990729005+-5.91219077926862
theta slope = -10.256509985560292+-23.831096783265917
chi2/ndof = 1841.871642944485