FROM TH2F
constant
0.03060872931255842+-0.0186501064050755
chi2/ndof = 0.020466355420857927
plane
-0.06004040485707551+-0.11540723672691813
invpt slope = 0.007035409185912563+-0.010458430033780016
theta slope = 0.06880371718498297+-0.107212525910853
chi2/ndof = 0.011073023203262176
from tgraph2D
constant
0.04931462513730761+-0.002234264344019491
chi2/ndof = 0.0004592582185990085
plane
0.08046255425794849+-0.010881467949220597
invpt slope = 0.00726881676801132+-0.0006563898731563437
theta slope = -0.05245666186642004+-0.009662888600742861
chi2/ndof = 0.00016947597244065717