FROM TH2F
constant
7.823097821156531+-0.36413579662650614
chi2/ndof = 11.329611249167689
plane
18.076567155969492+-1.1055138641004907
invpt slope = -7.505972590361774+-0.5300314762096987
theta slope = 3.218644710732817+-1.8695265548633293
chi2/ndof = 7.680520112332006
from tgraph2D
constant
17.239231651543793+-1.0329677186436081
chi2/ndof = 78.95965076411377
plane
10.428923421573622+-1.8980385089531977
invpt slope = 5.657458987597193+-1.2394302665569452
theta slope = 3.9738463421063033+-2.8949947198756902
chi2/ndof = 60.14201973438754