FROM TH2F
constant
0.034040334110981924+-0.017836310260809438
chi2/ndof = 0.10667099295563595
plane
-0.02632629853341835+-0.03777155893558519
invpt slope = 0.06978087486477023+-0.02348377503325347
theta slope = 0.01258613523302684+-0.05764841983277569
chi2/ndof = 0.018491532595857615
from tgraph2D
constant
0.1231489013944713+-0.010975811462656844
chi2/ndof = 0.014697149342734011
plane
-0.04193864258764072+-0.007072421419014493
invpt slope = 0.07845456067515912+-0.0029398354193616422
theta slope = 0.044111311698126425+-0.011282633949012333
chi2/ndof = 0.0013981803936410745