FROM TH2F
constant
7.435293868651462+-0.41107657566088085
chi2/ndof = 83.91060250271562
plane
-417.18628115898423+-10.272290216623642
invpt slope = -7.6340255116487805+-0.38014002456290685
theta slope = 392.6123061783124+-9.57537782800249
chi2/ndof = 43.94555539832488
from tgraph2D
constant
84.42157090836373+-7.564922577746205
chi2/ndof = 2689.7185197809927
plane
-127.19885196064229+-88.12792748575146
invpt slope = 4.50659572926598+-5.193194045844185
theta slope = 164.22723802161568+-71.69141356689575
chi2/ndof = 2450.6336411408806