FROM TH2F
constant
6.101428083585199+-0.27112945609742106
chi2/ndof = 0.9215549972506349
plane
16.179249792612147+-1.5069032381513023
invpt slope = -0.4109979076038078+-0.19404676650021802
theta slope = -7.620463427865657+-1.258074130842001
chi2/ndof = 0.3391232122320026
from tgraph2D
constant
7.129787909672997+-0.2918736433311703
chi2/ndof = 7.7523103525344155
plane
17.855105946798073+-0.7879602032755375
invpt slope = -0.4855497698086526+-0.1111415970343914
theta slope = -8.661204410787484+-0.7070466862369476
chi2/ndof = 2.317096463819029