FROM TH2F
constant
14.060507272335352+-0.5785965625691917
chi2/ndof = 7.292133362063372
plane
-31.476853136450643+-4.872590526976256
invpt slope = -5.491776850485836+-0.5896174149032577
theta slope = 52.661263496820446+-5.017348325229776
chi2/ndof = 4.423539475914601
from tgraph2D
constant
26.195931354427998+-3.2580016146542143
chi2/ndof = 498.8850032975222
plane
-4.966259788288999+-23.254257391319214
invpt slope = -12.054913581526899+-1.996458224351046
theta slope = 46.078496880171464+-21.396342550920583
chi2/ndof = 284.6273584330906