FROM TH2F
constant
19.444588205375478+-0.48995575786492146
chi2/ndof = 2.875437051501576
plane
6.357023545553249+-1.1613878798440167
invpt slope = 6.732093413015778+-0.6298238262787559
theta slope = 10.559679179712822+-1.6066087592739475
chi2/ndof = 0.7907793643772651
from tgraph2D
constant
20.447142542496277+-0.9122099535299154
chi2/ndof = 80.71631911484695
plane
6.194640036973533+-1.0358326448085506
invpt slope = 7.113687621387504+-0.5197009342315079
theta slope = 11.478878095049103+-1.4080401818921475
chi2/ndof = 21.085586131249986