FROM TH2F
constant
5.263573628398726+-0.2353848723002992
chi2/ndof = 0.24517841152877753
plane
7.2999095643075185+-1.679339367704674
invpt slope = -0.07050367387622301+-0.1307260455962109
theta slope = -1.6094293479328838+-1.3886806710961515
chi2/ndof = 0.2341179711620864
from tgraph2D
constant
5.497735646701106+-0.11984865469082338
chi2/ndof = 1.4220063032895174
plane
9.149359597071347+-0.7356673179977052
invpt slope = -0.06575835798604815+-0.059233430066670825
theta slope = -3.0883818713160114+-0.6060861567277193
chi2/ndof = 1.141434613135215