FROM TH2F
constant
23.74827818137268+-0.5108523171205119
chi2/ndof = 10.977947341449882
plane
12.183155620521536+-1.2102041523496458
invpt slope = 6.867482856300638+-0.5445156040167598
theta slope = 5.19709687564832+-1.7276650174679453
chi2/ndof = 9.192206433139361
from tgraph2D
constant
31.193269499467245+-2.51380688877875
chi2/ndof = 676.1570830824077
plane
4.8938640097608594+-4.393858488386672
invpt slope = 15.818621777129641+-1.9168581868930643
theta slope = 10.450767717494765+-5.955170667674477
chi2/ndof = 403.18147758813325