FROM TH2F
constant
8.376260643490356+-0.006420851222506831
chi2/ndof = 419.68798586890546
plane
3.610028912894219+-0.02439347805032858
invpt slope = 2.6976578538515343+-0.017207105108846345
theta slope = 3.6614581417183842+-0.024345801047369168
chi2/ndof = 267.9524580851419
from tgraph2D
constant
10.3523515547331+-0.14838903090442698
chi2/ndof = 7.310409077510162
plane
7.433852833874768+-0.3843294002214775
invpt slope = 0.7010348845398306+-0.1675890178268279
theta slope = 3.215475861963395+-0.47115112793546304
chi2/ndof = 6.087734621706704