FROM TH2F
constant
45.15039008642209+-0.623880999180663
chi2/ndof = 13.570188947241142
plane
24.30997364319096+-2.9604494662766907
invpt slope = 0.4134654676903838+-0.342777618205838
theta slope = 17.133045288594946+-2.5384026601489897
chi2/ndof = 13.35124981164922
from tgraph2D
constant
58.19653289061109+-2.601216291388209
chi2/ndof = 825.4917954343533
plane
66.71647167122568+-14.462491553739438
invpt slope = 3.863856595285907+-1.2913060225860524
theta slope = -17.42496423644062+-12.194289459775463
chi2/ndof = 774.2245944524616