FROM TH2F
constant
0.01779077524521731+-5.4223968515525814e-05
chi2/ndof = 164.3051149741213
plane
-0.008813430041934472+-0.00022728652670897986
invpt slope = 0.024803936881801405+-0.00014281090307561895
theta slope = 0.003536703373236883+-0.00023481293722241484
chi2/ndof = 53.498069466367554
from tgraph2D
constant
0.01233710624518067+-4.3324785096278516e-05
chi2/ndof = 232.1505904875181
plane
0.0006668208302696452+-6.971325387559915e-05
invpt slope = 0.019799219415708377+-9.730562458230962e-05
theta slope = -0.0032083229387368257+-0.0001558054367476862
chi2/ndof = 59.92998562720901