FROM TH2F
constant
0.018546133469061758+-0.01729540936743399
chi2/ndof = 0.009298686707397905
plane
0.003722464838043894+-0.04139398241763691
invpt slope = 0.01951113434560448+-0.029129897557849976
theta slope = -0.0001738741899040407+-0.0574989097461685
chi2/ndof = 0.002003888566818221
from tgraph2D
constant
0.023882011818660613+-0.0022317903354035448
chi2/ndof = 0.00038352838380377495
plane
0.002974669745066087+-0.0026552550016260995
invpt slope = 0.021250873909673302+-0.0016049111864486565
theta slope = 0.003396007467045291+-0.003977439328557149
chi2/ndof = 0.00011584938007334876