FROM TH2F
constant
36.85298010740068+-0.5324325903061753
chi2/ndof = 19.07175898455931
plane
53.02728831616115+-2.9729804772096107
invpt slope = -5.8539467679935475+-0.24942266681038971
theta slope = 8.162340156581326+-2.5246933829570053
chi2/ndof = 14.984467848141529
from tgraph2D
constant
55.48396569855006+-2.1220203955884682
chi2/ndof = 612.4039948952219
plane
98.03374825487924+-11.703588697636468
invpt slope = -2.278364483238966+-0.8904736229880378
theta slope = -29.34905515125096+-9.975076111237776
chi2/ndof = 543.7941586955096