FROM TH2F
constant
15.400021132409917+-0.5442005627288274
chi2/ndof = 34.652136426158435
plane
5.937359134984588+-3.138124006113838
invpt slope = -3.945846303924621+-0.4694167258765559
theta slope = 17.06970681932392+-2.7176620846993194
chi2/ndof = 33.84833930938952
from tgraph2D
constant
46.4701761647557+-4.382915881389974
chi2/ndof = 1094.96724156684
plane
118.84371215357126+-33.93026214961647
invpt slope = 0.6164381086176212+-3.6509428957689467
theta slope = -65.41949923954111+-28.314077255611366
chi2/ndof = 1025.6936994918628