FROM TH2F
constant
0.0167631272268565+-0.014211452713542475
chi2/ndof = 0.009151254087514443
plane
0.05087738334329285+-0.06593607622049782
invpt slope = -0.0021826372104384404+-0.009059278777355765
theta slope = -0.025760357416126534+-0.05505567449341245
chi2/ndof = 0.005798691593986616
from tgraph2D
constant
0.025832795789035076+-0.0013566477409042905
chi2/ndof = 0.0001693253645502004
plane
0.05105262993638572+-0.005084802877177998
invpt slope = -0.001324100477960078+-0.0007665454292418346
theta slope = -0.022567877024295933+-0.00472415280258346
chi2/ndof = 0.00013381389953887106