FROM TH2F
constant
44.88674704299459+-0.9878253121194946
chi2/ndof = 12.573548783371557
plane
-57.14716590116918+-11.14850885115535
invpt slope = -1.723970155015305+-0.7677554125021211
theta slope = 85.307930439604+-8.92836893956765
chi2/ndof = 10.980035081065795
from tgraph2D
constant
62.354601562525055+-4.521041997822556
chi2/ndof = 1021.9910389145202
plane
-45.36071744165628+-48.44804545239116
invpt slope = -7.1853883396488945+-2.6802336587416553
theta slope = 96.54039236338714+-37.456739036215666
chi2/ndof = 808.2236795102843