FROM TH2F
constant
25.948044443144784+-0.6318233003640574
chi2/ndof = 35.295912327697295
plane
-77.7795095585667+-4.334868820511894
invpt slope = -9.305592152059813+-0.4688220566758815
theta slope = 125.01865185335045+-3.9757360834822064
chi2/ndof = 16.495137733188518
from tgraph2D
constant
58.760526045928074+-4.057946192410978
chi2/ndof = 1136.2179826711117
plane
84.4709276898766+-32.97707885540071
invpt slope = -5.093890445379683+-2.4361291428118497
theta slope = -11.139973852497434+-27.994470686994152
chi2/ndof = 1090.3656891213498