FROM TH2F
constant
0.01442848515794806+-0.017710525706483182
chi2/ndof = 0.011683948375946015
plane
0.07991470718539052+-0.13339067828282627
invpt slope = 0.004272216695950795+-0.018615172162607937
theta slope = -0.05837240012730959+-0.10616776894408206
chi2/ndof = 0.003256798829686064
from tgraph2D
constant
0.02398605869636137+-0.0023623253558829227
chi2/ndof = 0.00027902905435354925
plane
0.0855606917267366+-0.00570481191595404
invpt slope = 0.0062233917545889104+-0.0012281505161526392
theta slope = -0.06378906298119909+-0.0048668476055933035
chi2/ndof = 5.5912848336642405e-05