FROM TH2F
constant
6.180123560739064+-0.20504062251107952
chi2/ndof = 0.8474071689709116
plane
16.067625238941613+-1.1645880662208825
invpt slope = -0.2596179798022945+-0.09691086039157087
theta slope = -7.626013665930072+-0.9812629618607845
chi2/ndof = 0.3286827526086769
from tgraph2D
constant
7.082795093732237+-0.21427900952567358
chi2/ndof = 7.116901573444838
plane
17.457553259907012+-0.6022529825296018
invpt slope = -0.22206948596124756+-0.05576588977064046
theta slope = -8.678010948219235+-0.5455284436910367
chi2/ndof = 2.3271512227443996