FROM TH2F
constant
15.044712593529633+-0.6292165678613307
chi2/ndof = 95.687628398356
plane
185.4291174197075+-6.411341847586124
invpt slope = -16.211184309595474+-0.6971993570561918
theta slope = -119.40321265649627+-5.619648812660381
chi2/ndof = 74.36613048787903
from tgraph2D
constant
105.71372177450814+-7.393814280432514
chi2/ndof = 2296.0765663644156
plane
129.47107968208718+-67.857671445324
invpt slope = -2.502138337688897+-7.25599096984073
theta slope = -20.110277961445206+-63.563553691583955
chi2/ndof = 2403.8919679439687