FROM TH2F
constant
0.010495152680865514+-0.007355183553708967
chi2/ndof = 0.0032671875021346346
plane
0.0030653371007851654+-0.017695271524743428
invpt slope = 0.0025959630663370346+-0.004236252972556586
theta slope = 0.0018145949421008978+-0.02096892953253159
chi2/ndof = 0.0012488600474439523
from tgraph2D
constant
0.012896626263461202+-0.0004727395328171136
chi2/ndof = 4.715484250187675e-05
plane
0.004088978114834307+-0.0007114028617816884
invpt slope = 0.0025789240590927214+-0.00014516203416503674
theta slope = 0.0019844934165339184+-0.0008868954100445034
chi2/ndof = 1.783652303329645e-05