FROM TH2F
constant
0.027402136855285447+-0.01680762493903324
chi2/ndof = 0.014185224513025058
plane
0.021052678019712008+-0.08028277584840815
invpt slope = 0.004649706922961175+-0.010605781935940573
theta slope = -0.003870332766131881+-0.06610336767002419
chi2/ndof = 0.01236949519200345
from tgraph2D
constant
0.04000362361603628+-0.0021738537996202423
chi2/ndof = 0.00048201531489419484
plane
0.06199271047858855+-0.007292825429200579
invpt slope = 0.008702475816088094+-0.0008853528941024121
theta slope = -0.04019875766724579+-0.0060339608574220376
chi2/ndof = 0.00019680436483016374