FROM TH2F
constant
20.53686160955859+-0.5131209386437044
chi2/ndof = 11.440879669322523
plane
-0.7478025155569981+-1.1506411280041668
invpt slope = 13.490514220394633+-0.6391886473175293
theta slope = 17.032773181684277+-1.7029965999840202
chi2/ndof = 4.5737330083409224
from tgraph2D
constant
27.588475491819143+-2.4413752109955182
chi2/ndof = 560.2694139079188
plane
-5.480246929427345+-3.0758024446255803
invpt slope = 18.093585015419237+-1.500263299378857
theta slope = 23.350947428151187+-4.437816390041624
chi2/ndof = 185.7615642817684