FROM TH2F
constant
26.049324433687868+-0.49573011204374084
chi2/ndof = 31.933965104884457
plane
6.38257569868442+-1.8845853076348777
invpt slope = -1.2758582379662968+-0.3270288780670113
theta slope = 23.483968265115102+-1.5912097076268747
chi2/ndof = 30.231339218325463
from tgraph2D
constant
56.30172322875616+-3.452578071763736
chi2/ndof = 1346.9933697594302
plane
86.46023053740848+-15.581912054739947
invpt slope = 3.731839629286989+-2.1038643014204896
theta slope = -36.12497553594534+-13.876720173830144
chi2/ndof = 1267.1289603255639