FROM TH2F
constant
11.316365201617442+-0.334728576005735
chi2/ndof = 1.5392197553247953
plane
5.94157051379004+-0.8532127974707562
invpt slope = 1.876233437243858+-0.3428076402763944
theta slope = 4.568444674835154+-1.0834243758248203
chi2/ndof = 1.0773089377497311
from tgraph2D
constant
12.413955194886315+-0.5164333368502274
chi2/ndof = 31.204296784946884
plane
5.930247152040047+-0.9255846475110866
invpt slope = 2.7086908691108835+-0.36340829913454586
theta slope = 4.500136102486799+-1.2521498169295762
chi2/ndof = 19.178665457447035