FROM TH2F
constant
0.04701746617482209+-0.01607288793213451
chi2/ndof = 0.004664564916299349
plane
0.04349754450665566+-0.04636813108801194
invpt slope = 0.0050232600934202905+-0.009496527912235935
theta slope = -0.012301930800671233+-0.046617051846864384
chi2/ndof = 0.002441178661861463
from tgraph2D
constant
0.05231702369547369+-0.0010818207268696073
chi2/ndof = 0.00023523755307004837
plane
0.05087868968579658+-0.0021911783899364007
invpt slope = 0.0036342084779657584+-0.00044163748010689607
theta slope = -0.012515250927135076+-0.0024271945898932815
chi2/ndof = 0.00015745878361741919