FROM TH2F
constant
29.563699865820375+-0.46118162147754355
chi2/ndof = 13.782029893692735
plane
38.87863502043913+-1.0789110377505335
invpt slope = -0.40544195359636526+-0.3883199340085326
theta slope = -10.117473174455652+-1.0516659958579837
chi2/ndof = 13.189960421232602
from tgraph2D
constant
41.280386890162184+-1.7741711014190302
chi2/ndof = 500.48161332001683
plane
23.375143824059034+-3.7113640168299034
invpt slope = 6.961766091885405+-1.3610434899352613
theta slope = 9.41830151723704+-3.8231904784636974
chi2/ndof = 411.97510546632805