FROM TH2F
constant
34.13392356685069+-0.683804061499238
chi2/ndof = 32.715398154523896
plane
7.928676814580591+-2.886124687451271
invpt slope = -7.33000518856492+-0.5601722685700137
theta slope = 41.404941008229954+-3.1260592371252622
chi2/ndof = 30.436901734138427
from tgraph2D
constant
67.50307824658847+-4.512430598010067
chi2/ndof = 1588.2383309209085
plane
71.36428043823746+-25.23028493225725
invpt slope = -2.061654011566338+-3.480500157826652
theta slope = 0.2680496454633188+-22.610532716543954
chi2/ndof = 1622.8926497164466