FROM TH2F
constant
21.26434712268609+-0.4124497262118525
chi2/ndof = 18.922684850049503
plane
54.61781766497189+-2.009070476775867
invpt slope = -3.6256980730295645+-0.19107618055825207
theta slope = -15.999537838296915+-1.6794978680800734
chi2/ndof = 14.613136102240944
from tgraph2D
constant
41.05538878365287+-2.296119121660005
chi2/ndof = 695.925519080411
plane
60.378614006917374+-9.183571638856272
invpt slope = -7.891035827340879+-0.9124583887378365
theta slope = 2.78958538489392+-8.2484481284973
chi2/ndof = 440.6085007795524