FROM TH2F
constant
13.859904451904011+-0.4481832000067545
chi2/ndof = 55.72974905478421
plane
76.71591578559003+-5.393020803333964
invpt slope = 0.6773082080492738+-0.20708589724777657
theta slope = -48.570478884199964+-3.836198754767116
chi2/ndof = 52.24093279146373
from tgraph2D
constant
66.1219362176417+-4.008171965169509
chi2/ndof = 1172.7773021056507
plane
16.10729443074358+-47.20833927044895
invpt slope = -0.9091580600961089+-1.8770577078966941
theta slope = 42.56447142935625+-37.23915542101895
chi2/ndof = 1179.223140393717