FROM TH2F
constant
0.7293515862015697+-0.0719215286632953
chi2/ndof = 0.790842928982212
plane
0.008034476630077114+-0.15755671702439364
invpt slope = 0.02147900706319994+-0.05644224863410147
theta slope = 1.3165905890223535+-0.18761697799965554
chi2/ndof = 0.44489002498696556
from tgraph2D
constant
1.4107141805002823+-0.07604693485685865
chi2/ndof = 0.9310849428272903
plane
-0.1034924489340627+-0.11493159990343405
invpt slope = 0.3765032456497978+-0.042819305253270025
theta slope = 1.217280737077361+-0.11685187388735983
chi2/ndof = 0.39909388667096185