FROM TH2F
constant
12.763807210327542+-0.6127039205937469
chi2/ndof = 84.67250349326154
plane
53.87760577946272+-8.909299539706549
invpt slope = -1.1657794264275287+-0.5158092705389598
theta slope = -30.752811369404935+-7.552044940167167
chi2/ndof = 88.51691753881605
from tgraph2D
constant
85.62681937660146+-9.933961349604747
chi2/ndof = 3749.9763509991535
plane
138.56173060134657+-88.67859331925186
invpt slope = 36.68752203043521+-6.8909392868957955
theta slope = -88.38823408856517+-72.39717861421758
chi2/ndof = 2168.924876454193