FROM TH2F
constant
0.04255457678514345+-0.018990313500561896
chi2/ndof = 0.01500431658513329
plane
0.09301501150612004+-0.12363609754876387
invpt slope = 0.010136647710957349+-0.010551385056429134
theta slope = -0.06323761121256938+-0.10237986008395655
chi2/ndof = 0.004673641332352764
from tgraph2D
constant
0.055461511482647496+-0.002766302220546686
chi2/ndof = 0.0009489010690381698
plane
0.11492465588513956+-0.008821517779924858
invpt slope = 0.010572779703903712+-0.0008066336963794301
theta slope = -0.07960574842207968+-0.007412582455435741
chi2/ndof = 0.0002978596860710168