FROM TH2F
constant
26.942225672407613+-0.6875104556498709
chi2/ndof = 40.267177617404016
plane
18.473291926808137+-3.921595906767712
invpt slope = -2.505652003265793+-0.7733250307427904
theta slope = 12.436605193638007+-4.158631784292483
chi2/ndof = 41.491244641734
from tgraph2D
constant
71.97998098943931+-6.267932672415533
chi2/ndof = 2475.079743622113
plane
186.95409172960183+-28.760396493014515
invpt slope = -11.389465685840763+-6.297996084547885
theta slope = -99.08286484800439+-25.50503663578823
chi2/ndof = 2002.7116407681256