FROM TH2F
constant
0.014415128138697098+-0.012655753254699443
chi2/ndof = 0.008562725003052345
plane
0.026474578935483488+-0.15002207032735224
invpt slope = 0.004398095248939054+-0.005192853351935874
theta slope = -0.01948490024570077+-0.1218070026833944
chi2/ndof = 0.00040913384567172086
from tgraph2D
constant
0.021995059425880883+-0.001346776613354914
chi2/ndof = 0.0001704978811505969
plane
0.041562384902801855+-0.0036937203083416124
invpt slope = 0.004539861104865639+-0.00011466847832538608
theta slope = -0.03201797546739362+-0.00300458027619164
chi2/ndof = 9.135846491330149e-06