FROM TH2F
constant
0.5400795122000617+-0.10607382570895746
chi2/ndof = 0.7723282114651815
plane
-4.566241609337285+-0.9626786405305353
invpt slope = -0.12448691864511974+-0.10511138366199867
theta slope = 4.971893357576495+-0.8950212719628055
chi2/ndof = 0.12048540575284444
from tgraph2D
constant
1.2988888076615175+-0.05450545310232533
chi2/ndof = 0.15448390966587594
plane
-2.264139603347229+-0.34649712006691574
invpt slope = -0.03911187914542757+-0.020718672737089605
theta slope = 3.0010163158056002+-0.2842776913925606
chi2/ndof = 0.048709131197996546