FROM TH2F
constant
8.489974370525873+-0.30713685620169007
chi2/ndof = 1.831793978460872
plane
8.259506101920023+-0.7828261538670023
invpt slope = 1.5165321997838532+-0.3782296456235117
theta slope = -3.1491627884041344+-0.9318672561793955
chi2/ndof = 1.5975188872670383
from tgraph2D
constant
10.474232212722477+-0.5880143234039331
chi2/ndof = 36.650649524157565
plane
9.219491462910533+-1.2193789520350948
invpt slope = 2.354230696003476+-0.5425944114149989
theta slope = -3.214992678937491+-1.6593263284060906
chi2/ndof = 30.99188445740478