FROM TH2F
constant
2.442443316449613+-0.29534745379509514
chi2/ndof = 38.484355814834736
plane
-41.27501787955247+-4.386970731900307
invpt slope = 1.211899248669107+-0.3582598574650887
theta slope = 40.71603649851536+-3.9893694667241766
chi2/ndof = 37.32419680909463
from tgraph2D
constant
35.18038369686999+-9.565935656716563
chi2/ndof = 2928.2280020046855
plane
-290.06955182343603+-64.49947258991436
invpt slope = 36.62325513757027+-6.480869057264181
theta slope = 250.04624831123544+-56.66914614927212
chi2/ndof = 1129.0047228289689