FROM TH2F
constant
0.005295157513343086+-0.011096990492358023
chi2/ndof = 0.0019319428418143342
plane
0.008829168895288727+-0.08551479656555099
invpt slope = 0.0018380564596270474+-0.012272523269998796
theta slope = -0.004585945285616425+-0.07036867394793375
chi2/ndof = 0.0014525848958636526
from tgraph2D
constant
0.0065197696124205+-0.000539027196608808
chi2/ndof = 1.4236965615521216e-05
plane
0.016452387246850005+-0.0027398380663836057
invpt slope = 0.002728806710636283+-0.0003634367038424538
theta slope = -0.010811207785099456+-0.0022314913803348894
chi2/ndof = 5.906520492628712e-06