FROM TH2F
constant
0.01478688919869106+-0.0175516435613159
chi2/ndof = 0.00485306557711871
plane
0.04553830779748337+-0.173092244133348
invpt slope = 0.0033178517623498553+-0.013433656355491479
theta slope = -0.029100032962197573+-0.1374115317343431
chi2/ndof = 0.002717718993688185
from tgraph2D
constant
0.018575847499867765+-0.00112892239890889
chi2/ndof = 6.882115226871804e-05
plane
0.04643101852113667+-0.007671999565258838
invpt slope = 0.0036732703196931285+-0.0006118599502068688
theta slope = -0.028359509717884833+-0.006377451323350934
chi2/ndof = 3.798913472233465e-05