FROM TH2F
constant
0.007326517636878342+-0.011239184561633982
chi2/ndof = 0.020985853157351773
plane
-0.00281535412983578+-0.10121706686681511
invpt slope = 0.0019485406615755401+-0.007755271301880532
theta slope = 0.00473269996052244+-0.08561251927396778
chi2/ndof = 0.02006854238310192
from tgraph2D
constant
0.026767787996164402+-0.0050464469476106865
chi2/ndof = 0.0015789308613830622
plane
0.030973041849364995+-0.046413026125759795
invpt slope = 0.012525338144294507+-0.0020793132185508694
theta slope = -0.02984642496550584+-0.03609132620068067
chi2/ndof = 0.0010084154499382584