FROM TH2F
constant
15.643712373885998+-0.4868531042094488
chi2/ndof = 5.25875276424196
plane
3.9139609871486885+-1.10006142620688
invpt slope = 10.447995259762+-0.7496989428063866
theta slope = 4.394153350574773+-1.6482526256342542
chi2/ndof = 2.0273127894841094
from tgraph2D
constant
18.468256422184737+-1.3645201862155807
chi2/ndof = 150.81514237109485
plane
3.0393075934966522+-1.537659278882843
invpt slope = 12.24256482669417+-0.8851841827352904
theta slope = 6.912428359560904+-2.32587660525235
chi2/ndof = 41.534102984983235