FROM TH2F
constant
8.166838621943432+-0.3278084850368401
chi2/ndof = 12.025570403967807
plane
-2.9780302789488884+-2.805099400698252
invpt slope = -3.171085505268929+-0.18547590302105568
theta slope = 21.943116003039563+-2.406852147486467
chi2/ndof = 7.601686895499404
from tgraph2D
constant
20.128406470587613+-1.632784304197286
chi2/ndof = 213.2787662771864
plane
37.24565080110751+-12.221329276867523
invpt slope = -4.507822467557218+-0.7078650129062141
theta slope = -2.805033771686162+-10.107433701470704
chi2/ndof = 143.1882309092719