FROM TH2F
constant
0.017533157281669005+-0.015188793179678445
chi2/ndof = 0.016140325786087845
plane
0.049148946967206446+-0.1088751753575555
invpt slope = 0.01013670509929153+-0.01280967273873844
theta slope = -0.035989594239358366+-0.08352485075261337
chi2/ndof = 0.004589872391176027
from tgraph2D
constant
0.03156030861559814+-0.0028061338312833856
chi2/ndof = 0.0006378253534112522
plane
0.05448976744801446+-0.010240683329969288
invpt slope = 0.013649816100746125+-0.001184589665627653
theta slope = -0.043041023388234+-0.008668165417774223
chi2/ndof = 0.00023278711290053447