FROM TH2F
constant
0.015887259799635806+-0.018006381975442073
chi2/ndof = 0.003987912390045988
plane
0.022511765280250978+-0.12019818726369459
invpt slope = 0.006390633081055224+-0.019783470782492797
theta slope = -0.01309957510941423+-0.09764864296339455
chi2/ndof = 0.0012340981196414438
from tgraph2D
constant
0.018504027823279295+-0.0011473866880672
chi2/ndof = 6.977429923389824e-05
plane
0.027190041109430678+-0.0033720906082516096
invpt slope = 0.006770971934618405+-0.0005603709781665996
theta slope = -0.016996687441405943+-0.002894184826405255
chi2/ndof = 1.6241477694953817e-05