FROM TH2F
constant
0.02348984920313754+-0.0191579981654916
chi2/ndof = 0.007627373837016155
plane
0.06200997068003132+-0.14087230804178189
invpt slope = 0.0027897690949214827+-0.016588815281623523
theta slope = -0.03616984469808617+-0.11128031337387868
chi2/ndof = 0.005504477841468679
from tgraph2D
constant
0.02962264663719535+-0.0017890441380495233
chi2/ndof = 0.00022084684602454813
plane
0.07352763714518995+-0.00636194610460792
invpt slope = 0.00566109965814489+-0.0008914920046121541
theta slope = -0.04659521436754354+-0.005109290048810681
chi2/ndof = 7.531457909564454e-05