FROM TH2F
constant
0.0349637031011448+-0.02052436197942784
chi2/ndof = 0.010539735413436259
plane
0.07720696954670254+-0.1478531835036595
invpt slope = 0.007934594636859032+-0.012978509001750753
theta slope = -0.051649203285029845+-0.12001600460518785
chi2/ndof = 0.003003429284344682
from tgraph2D
constant
0.04381283581254337+-0.0022445954113517346
chi2/ndof = 0.00043832414480020067
plane
0.09222007753425222+-0.0077530680192770774
invpt slope = 0.008011338815962384+-0.0007801907987412109
theta slope = -0.06280735173366042+-0.006544355792498558
chi2/ndof = 0.0001338855039067025