FROM TH2F
constant
0.01592028503524255+-0.018809149685555353
chi2/ndof = 0.0075580993084155
plane
0.005727900650703476+-0.04595540369728248
invpt slope = 0.021000465266910278+-0.04015802872536815
theta slope = -0.006175947208276632+-0.06737388739643416
chi2/ndof = 0.0011776860361742047
from tgraph2D
constant
0.019100915139480045+-0.0018670412919059842
chi2/ndof = 0.00020566474795693582
plane
0.004925404593540409+-0.0012840336502668627
invpt slope = 0.020934495222919024+-0.0009488588195749024
theta slope = -0.0008723697353138634+-0.002196133061480345
chi2/ndof = 2.1974691212327386e-05