FROM TH2F
constant
27.98508900052559+-0.7975115991705035
chi2/ndof = 42.69437775977877
plane
-65.90613282628529+-3.5635850497989727
invpt slope = 14.557360648064446+-1.4028382012847234
theta slope = 82.98800027337703+-2.96998255195021
chi2/ndof = 23.958438321114116
from tgraph2D
constant
67.78653535609055+-6.971028499779046
chi2/ndof = 2283.976201440612
plane
22.232729303916074+-35.67101650381599
invpt slope = 24.48764284663975+-7.386025452952806
theta slope = 6.201679505684297+-28.520731060482248
chi2/ndof = 1902.6078440538365