FROM TH2F
constant
36.90623454730667+-0.5267736554013565
chi2/ndof = 15.446902609122505
plane
64.58806589264627+-2.8400779300457093
invpt slope = -5.430565802989744+-0.22710651003968
theta slope = -2.696420838747205+-2.473290869619249
chi2/ndof = 10.995100678397286
from tgraph2D
constant
53.14032616748918+-2.4278096688034534
chi2/ndof = 819.3021096270928
plane
74.99246826356641+-11.695385449309189
invpt slope = -6.692334353976724+-0.8844570692288102
theta slope = 1.579987464581576+-10.429314435061155
chi2/ndof = 580.2768204277393