FROM TH2F
constant
0.02070536729828214+-0.01798669965161097
chi2/ndof = 0.029739169860484183
plane
-0.005605800592261253+-0.04247542756057706
invpt slope = 0.04063982289867268+-0.03228082482386722
theta slope = 0.0016628801972239458+-0.059220760145739335
chi2/ndof = 0.004662313297954183
from tgraph2D
constant
0.041461671659803634+-0.0046061275317565535
chi2/ndof = 0.0016760964563799397
plane
-0.007817881589190407+-0.003660775208773895
invpt slope = 0.04464102304891633+-0.0020996112214082515
theta slope = 0.010059394232428808+-0.0057595323051698784
chi2/ndof = 0.00023666297689875558