FROM TH2F
constant
21.698035038101565+-0.42700869881753284
chi2/ndof = 21.95898585950161
plane
73.99550266608031+-2.328857303487828
invpt slope = -3.2170393316411134+-0.21101838379249171
theta slope = -33.29700226633752+-1.7719866849163795
chi2/ndof = 17.382001315351744
from tgraph2D
constant
46.333265842825874+-2.28901151224061
chi2/ndof = 660.1862888344767
plane
58.270917092663055+-12.195177200834928
invpt slope = -4.412079380240466+-1.0704341765698762
theta slope = 1.3778008971137972+-10.633938906940578
chi2/ndof = 589.2139320055315