FROM TH2F
constant
17.662055207458675+-0.49528408200029345
chi2/ndof = 45.99954786687218
plane
-19.856881083095196+-2.178798978934693
invpt slope = 0.5414898106041717+-0.4958571042203543
theta slope = 57.34359185039777+-1.65261938591985
chi2/ndof = 24.1848505035696
from tgraph2D
constant
67.06735342458065+-5.627889561403369
chi2/ndof = 2502.178132476241
plane
-64.11336832019039+-20.828553578911805
invpt slope = 1.8941256088217457+-2.9961329403722354
theta slope = 124.28262235064884+-18.433439296080817
chi2/ndof = 1606.8711964739587