FROM TH2F
constant
19.17665670161897+-0.7012197564535254
chi2/ndof = 9.552770460755733
plane
107.82539384717046+-7.42208968475109
invpt slope = -5.6487053454185965+-0.7240751369937098
theta slope = -65.28559663411387+-5.676138646736859
chi2/ndof = 5.964614618765772
from tgraph2D
constant
29.171660406778734+-1.8159591821084173
chi2/ndof = 145.09914098686983
plane
98.78152188034791+-13.089802705363551
invpt slope = -4.51690047638125+-1.2720043016925278
theta slope = -54.46431461342311+-10.979139852658031
chi2/ndof = 82.54622944966758