FROM TH2F
constant
18.78107528284939+-0.6460319100455626
chi2/ndof = 7.398566127698711
plane
4.304919153929808+-1.4533556620397177
invpt slope = 17.38964698770591+-1.309227857048505
theta slope = 5.847945834165008+-2.3940240392015233
chi2/ndof = 3.241536762565926
from tgraph2D
constant
22.329034203978896+-2.335355105377035
chi2/ndof = 321.7791249915227
plane
6.773694782850424+-3.4642221261096235
invpt slope = 19.796037250950125+-2.559946707285643
theta slope = 4.216114149072749+-5.924994836863153
chi2/ndof = 159.94896450345632