FROM TH2F
constant
33.49093928903394+-0.5037055056965948
chi2/ndof = 7.977455389567413
plane
65.87072038727479+-2.704644931424444
invpt slope = -2.7625734731795375+-0.22023860826821579
theta slope = -18.025518317085208+-2.437764151216717
chi2/ndof = 5.815109160377645
from tgraph2D
constant
41.64920757262859+-1.598624076324388
chi2/ndof = 352.6726536782141
plane
62.39020281727807+-8.448750002679255
invpt slope = -2.3717988475443135+-0.6592858248295889
theta slope = -11.176853941261028+-7.695473543463056
chi2/ndof = 315.34919421232695