FROM TH2F
constant
14.426478213079479+-0.4987307719333584
chi2/ndof = 42.8277293731229
plane
-156.85615674481883+-4.8664091660066875
invpt slope = -6.648784534267624+-0.23217162771899663
theta slope = 176.45080515334274+-4.827324403635049
chi2/ndof = 19.157072853525232
from tgraph2D
constant
61.89303654837293+-5.40907442702453
chi2/ndof = 1843.2594283790565
plane
-72.81959073280426+-39.0734837946608
invpt slope = -9.42731087397971+-1.8204431817178561
theta slope = 130.0944198759622+-32.07065571471885
chi2/ndof = 1129.3335823095597