FROM TH2F
constant
0.34119970496943264+-0.03938156603877514
chi2/ndof = 11.425256350328082
plane
0.08460527533942919+-0.14795003183034555
invpt slope = -0.031479603315169+-0.018210110896786414
theta slope = 0.5960218778689017+-0.10584575658804694
chi2/ndof = 11.337838914997628
from tgraph2D
constant
13.718600725450319+-2.024515840986342
chi2/ndof = 1004.1727755186596
plane
18.08639820590864+-7.5196830027967385
invpt slope = 2.4377710707216456+-0.6419533914692143
theta slope = -15.830186763286873+-6.340267255148148
chi2/ndof = 931.0405055521246