FROM TH2F
constant
0.018035909649045872+-0.01561180671534898
chi2/ndof = 0.006982972937537832
plane
0.003919906943767108+-0.03675561459820762
invpt slope = 0.015141466993465203+-0.02147012410361194
theta slope = 0.0005781632654854815+-0.05288060687866747
chi2/ndof = 0.00016628707545698014
from tgraph2D
constant
0.021532981099774296+-0.0014844228800637404
chi2/ndof = 0.00019611250452829476
plane
0.004056505261277429+-0.0005605424492553341
invpt slope = 0.0152339586155417+-0.0002839486916082601
theta slope = 0.0007852651146883103+-0.0008349421106237039
chi2/ndof = 5.745780855115044e-06