FROM TH2F
constant
0.014230628715656031+-0.02016406188995422
chi2/ndof = 0.010379300269695574
plane
0.09007360285394882+-0.21068126443363175
invpt slope = -0.0031636930496016847+-0.019961318109123476
theta slope = -0.05593335356773776+-0.17489502331088813
chi2/ndof = 0.005656327044994017
from tgraph2D
constant
0.023035782799122707+-0.001655714578550165
chi2/ndof = 0.00010691423985919253
plane
0.06310461814130955+-0.01025405471473472
invpt slope = 0.004757526094796161+-0.001226775926489481
theta slope = -0.039388469327836836+-0.008314311316609065
chi2/ndof = 5.168727642809791e-05