FROM TH2F
constant
27.403555093972166+-0.5370833034328509
chi2/ndof = 13.055104278822842
plane
18.23323888716398+-3.126859731845369
invpt slope = 0.08487946196044283+-0.3030839362844141
theta slope = 8.107423155667435+-2.472806838756661
chi2/ndof = 13.22027005190697
from tgraph2D
constant
39.875732841564+-2.0216263293524874
chi2/ndof = 404.6103274212492
plane
76.61242598438514+-13.36810702216327
invpt slope = 0.02086319010951332+-1.0763545444399756
theta slope = -33.00518319360094+-11.01343554041777
chi2/ndof = 376.90158750142706