FROM TH2F
constant
6.950017975727139+-0.2636288674768504
chi2/ndof = 0.40325761770449725
plane
4.753090083904836+-0.6410476360403919
invpt slope = -0.22226801105705873+-0.29866252806105564
theta slope = 4.148802157503814+-0.7424888939784572
chi2/ndof = 0.08968598720364332
from tgraph2D
constant
7.283636912769725+-0.17190082545503116
chi2/ndof = 3.4868874638624856
plane
4.695494203800823+-0.17586446402201192
invpt slope = -0.18334519306328148+-0.08142251345394667
theta slope = 4.293765168728672+-0.20922279314904732
chi2/ndof = 0.7593446048642637