FROM TH2F
constant
0.018949685782057555+-0.01946776093140471
chi2/ndof = 0.0022027550342792737
plane
0.023733289415329387+-0.16459975199677115
invpt slope = 0.0030445418713945043+-0.015429756100005304
theta slope = -0.008645880949895896+-0.13856194110697082
chi2/ndof = 0.001447667605083579
from tgraph2D
constant
0.020131696201124618+-0.000982040496974901
chi2/ndof = 5.304219457314096e-05
plane
0.028672535071345234+-0.0068391926406056085
invpt slope = 0.003272221656604394+-0.0005882170412950063
theta slope = -0.012317913765626035+-0.005861412885575387
chi2/ndof = 3.426122006689251e-05