FROM TH2F
constant
0.017784633441351498+-0.01782085127106059
chi2/ndof = 0.003486993366532172
plane
0.011344454162782763+-0.16653063228884876
invpt slope = 0.0021975557102195935+-0.01141810326315018
theta slope = 0.0016989559764819364+-0.1418344260257688
chi2/ndof = 0.002876756579525864
from tgraph2D
constant
0.01984223938120564+-0.00103632408066284
chi2/ndof = 6.551202360932397e-05
plane
0.01524932084317476+-0.00907731969425462
invpt slope = 0.002355872553232185+-0.0006317814316905474
theta slope = -0.0003399268698915086+-0.007705882347395653
chi2/ndof = 5.43585923463161e-05