FROM TH2F
constant
33.06205329577163+-0.7753246042193463
chi2/ndof = 37.62170646504513
plane
-135.1466194292536+-7.677732665319165
invpt slope = -3.540947320174009+-0.5951228962447888
theta slope = 148.50958943454657+-6.329154126755575
chi2/ndof = 28.227059881187635
from tgraph2D
constant
69.68864561517066+-5.524533248695145
chi2/ndof = 1800.707587276772
plane
-204.52761410218955+-52.63616061227551
invpt slope = 8.262838047884594+-2.3251687289719354
theta slope = 198.56022732084142+-40.86480829914826
chi2/ndof = 1140.4084727560196