FROM TH2F
constant
0.025410775264962403+-0.01644163606076299
chi2/ndof = 0.00836929534080868
plane
0.014361327405936205+-0.040050084662221944
invpt slope = 0.006591005952771775+-0.021043058388863823
theta slope = 0.004236554812849512+-0.04136940645037234
chi2/ndof = 0.007275388774448908
from tgraph2D
constant
0.03281510810319664+-0.0019281524188293829
chi2/ndof = 0.0004201082077856114
plane
0.010692217827656617+-0.0029199791018880046
invpt slope = 0.011244564376359586+-0.0012808729109921864
theta slope = 0.013240270908880091+-0.0035061779439618302
chi2/ndof = 0.00021472072450583223