FROM TH2F
constant
26.463583944851457+-0.4755885595370863
chi2/ndof = 28.040034338831084
plane
51.685318142880845+-2.7631541532099386
invpt slope = -6.429800735213039+-0.23271329181374578
theta slope = -0.4718852037923007+-2.325952464980842
chi2/ndof = 21.830584807185076
from tgraph2D
constant
52.72841098902234+-2.835222183117851
chi2/ndof = 988.7336347805622
plane
92.26987372515133+-13.670736803584251
invpt slope = 1.1068841648565955+-1.5708746550550345
theta slope = -38.10560120610348+-11.797124708272287
chi2/ndof = 923.8280653438788