FROM TH2F
constant
43.557898986243075+-1.006466291146108
chi2/ndof = 36.17427449626283
plane
-37.54338514085596+-3.854624242229554
invpt slope = 23.323100691306127+-1.4096354000245623
theta slope = 50.43753392966585+-3.3472411825535007
chi2/ndof = 24.960607234150256
from tgraph2D
constant
74.49639515109035+-6.626563638419631
chi2/ndof = 2019.9218997230305
plane
120.3452922759712+-30.439539816912106
invpt slope = 20.729493421084577+-6.449957546238568
theta slope = -71.1780577562464+-24.826844940034647
chi2/ndof = 1421.8183703972581