FROM TH2F
constant
25.115699794167547+-0.6580496236612456
chi2/ndof = 22.384070093673614
plane
6.222884272735455+-1.3272613578306085
invpt slope = 22.651740503066524+-1.0683452029447484
theta slope = -0.17142024320932414+-2.1917628939963882
chi2/ndof = 14.22327286864099
from tgraph2D
constant
40.0080396791378+-5.784871015337762
chi2/ndof = 2409.4607518585763
plane
-8.170934581456908+-7.5210354713702205
invpt slope = 40.804392440226295+-4.807876880778332
theta slope = 17.332022671905623+-12.955169977346218
chi2/ndof = 1058.8949332616774