FROM TH2F
constant
9.634427567964424+-0.35604604174176396
chi2/ndof = 1.5683906779643855
plane
8.923021683652902+-0.888236041768023
invpt slope = -0.8831797329434108+-0.44176421105214375
theta slope = 3.6507327142428356+-1.2328981017843392
chi2/ndof = 1.462924725158572
from tgraph2D
constant
10.894027164467703+-0.41585510155830097
chi2/ndof = 15.73712737222227
plane
6.49954823977248+-0.7081249697443628
invpt slope = 1.0611699101541843+-0.38566518162176044
theta slope = 5.992593498763178+-1.0388330622471822
chi2/ndof = 10.226796374499513