FROM TH2F
constant
12.585070979482333+-0.2666497625188022
chi2/ndof = 15.453462086025672
plane
6.697856641051487+-0.6729955250195246
invpt slope = 2.0388744775274326+-0.181014061720584
theta slope = 1.205772776401309+-0.8430577573047143
chi2/ndof = 14.810671301737212
from tgraph2D
constant
26.548771310569986+-3.021966398441153
chi2/ndof = 1771.6624980972917
plane
-11.164543821846733+-6.155232863383329
invpt slope = 11.55391914920446+-1.3628344886612898
theta slope = 11.373985675505295+-7.785881594347573
chi2/ndof = 1258.843696920132