FROM TH2F
constant
4.7255507042098035+-0.3842830465467365
chi2/ndof = 4.621810629066125
plane
-3.1026186992129228+-2.9987805422332734
invpt slope = -1.7402053024380617+-0.5674770684745954
theta slope = 11.024395555125107+-2.859227248420615
chi2/ndof = 3.9822323124573993
from tgraph2D
constant
8.909965401473826+-1.4183077272975724
chi2/ndof = 72.41748522080208
plane
31.514481451306533+-10.676838160157855
invpt slope = -3.499211280607247+-1.4483334572417657
theta slope = -18.387454776169395+-10.47794732221175
chi2/ndof = 59.93342292294705