FROM TH2F
constant
19.815584599999116+-0.40467908548996784
chi2/ndof = 16.153227002641295
plane
38.468172104370204+-1.2520418632792503
invpt slope = 4.416407337798059+-0.44754601047573006
theta slope = -26.441087077226882+-0.9510334382197668
chi2/ndof = 8.127627656329699
from tgraph2D
constant
35.08686515733936+-1.4530147627932364
chi2/ndof = 297.6865180491022
plane
35.561935162462746+-2.847684444876965
invpt slope = 6.565616410015706+-1.0384075064419778
theta slope = -14.929489668798444+-3.120722653990824
chi2/ndof = 207.79258055149836