FROM TH2F
constant
5.5730065899113885+-0.21640699637088734
chi2/ndof = 0.4408588916353059
plane
7.312931113891293+-1.3689172465813781
invpt slope = -0.2359634835754869+-0.10856040874868919
theta slope = -0.7372928563808565+-1.1486377230533817
chi2/ndof = 0.40494629687458866
from tgraph2D
constant
6.015045438057361+-0.13426260091840075
chi2/ndof = 2.2352793064520924
plane
9.218476584091233+-0.7506635891955434
invpt slope = -0.12034565304168304+-0.059246054294159134
theta slope = -2.5116841728762065+-0.650528453437835
chi2/ndof = 1.9539053502201411