FROM TH2F
constant
21.917820919561954+-0.40595029991183296
chi2/ndof = 20.408048523113827
plane
21.93358127788226+-1.7165318307896407
invpt slope = -3.9738666819542847+-0.1889852539524943
theta slope = 14.633734103452591+-1.6908949598176983
chi2/ndof = 17.186370069485314
from tgraph2D
constant
43.9375541841126+-2.249175935196015
chi2/ndof = 708.2309317999686
plane
59.49155951284179+-10.360367504414612
invpt slope = -5.479559002194715+-0.9050851385402781
theta slope = 1.8156506545138704+-9.353994706896419
chi2/ndof = 552.4420765324373