FROM TH2F
constant
0.03483811592149266+-0.019566206542685316
chi2/ndof = 0.018020119701972245
plane
0.06458389265715372+-0.1097004433679313
invpt slope = 0.007815034460400265+-0.01229634228324487
theta slope = -0.04195028019943058+-0.09394642998723288
chi2/ndof = 0.012053620091579354
from tgraph2D
constant
0.050975434751631174+-0.004360276144822821
chi2/ndof = 0.001806140765975938
plane
0.14753914076667396+-0.017356020797615748
invpt slope = 0.011321874076855618+-0.001993765107276761
theta slope = -0.11624680172526855+-0.015056569809756481
chi2/ndof = 0.0009436018184432307