FROM TH2F
constant
19.771960485566172+-0.4635866841952551
chi2/ndof = 22.646704072784964
plane
7.737857354327636+-1.0892085830050564
invpt slope = 3.7503711342424535+-0.4454282332229226
theta slope = 12.918886153051762+-1.5937548335461929
chi2/ndof = 21.407634572403907
from tgraph2D
constant
37.27782881477623+-4.068472201353714
chi2/ndof = 1787.6663333309418
plane
-14.68696856453108+-6.0703342210855515
invpt slope = 24.800205917862407+-2.64767853517571
theta slope = 32.28154901653226+-8.668005420265478
chi2/ndof = 833.862954262868