FROM TH2F
constant
6.965783679111308+-0.343604613366065
chi2/ndof = 17.964792111890166
plane
24.32900990284982+-1.1262753274897856
invpt slope = -10.041665394187618+-0.5841565213247379
theta slope = 0.7586332618707761+-1.829317479826225
chi2/ndof = 11.328492545424599
from tgraph2D
constant
22.219870926185827+-1.6575972839907562
chi2/ndof = 203.32452803082282
plane
9.872010680812465+-3.058638760829436
invpt slope = 7.7027971834539155+-1.9973090237200481
theta slope = 11.587443634963684+-4.665207268488794
chi2/ndof = 156.17961321100185