FROM TH2F
constant
0.01915811524955811+-0.0191944078603056
chi2/ndof = 0.02179432877924916
plane
0.0013548094082779366+-0.04433044718435609
invpt slope = 0.03673535894256966+-0.03973825008651018
theta slope = -0.006795205554099961+-0.06878919914358515
chi2/ndof = 0.005216372792941097
from tgraph2D
constant
0.03308956338932076+-0.0038644803804605945
chi2/ndof = 0.0009856577682838838
plane
0.0015311909998218993+-0.0037088033883237222
invpt slope = 0.04067033307982939+-0.0026461386755688454
theta slope = -0.0021581110596804454+-0.00603076013752884
chi2/ndof = 0.00021244828240338899