FROM TH2F
constant
4.305659320820721+-0.31281926665892124
chi2/ndof = 0.438401144580775
plane
-2.083805681309945+-2.6862295112786247
invpt slope = -0.2037991212833259+-0.271977693354542
theta slope = 6.132775433162334+-2.4323543760059327
chi2/ndof = 0.3018520943415295
from tgraph2D
constant
4.749497590647291+-0.17627072948079792
chi2/ndof = 1.4914257618288436
plane
-0.17662237122252655+-1.4914734199350286
invpt slope = -0.12284661346560585+-0.12918101927649667
theta slope = 4.549196091145356+-1.3240082693533328
chi2/ndof = 1.2298030305715735