FROM TH2F
constant
27.446146553456586+-0.7196192199114732
chi2/ndof = 25.7965726526982
plane
199.1230287043268+-7.504826330007174
invpt slope = -6.9656528234297355+-0.480436676313773
theta slope = -127.01945290859958+-6.022543005595035
chi2/ndof = 14.29139993449241
from tgraph2D
constant
52.72345418199795+-3.4115016209487665
chi2/ndof = 686.6622558907453
plane
179.84003079783665+-20.919092207159814
invpt slope = -2.1899456021272856+-1.9031438304451846
theta slope = -107.39471097091163+-18.491423679034913
chi2/ndof = 415.0731955202314