FROM TH2F
constant
0.03468257254518793+-0.01633367747737845
chi2/ndof = 0.029482116462608253
plane
0.006367476088184119+-0.03481467656922656
invpt slope = 0.021847353487801775+-0.013519100884149432
theta slope = 0.0008058539399688582+-0.05057685577832217
chi2/ndof = 0.00838218714634383
from tgraph2D
constant
0.05759124627199513+-0.0033608574806653375
chi2/ndof = 0.001649122999391168
plane
0.00435877299144031+-0.0028698343249520726
invpt slope = 0.025255145645897575+-0.0009032442052279027
theta slope = 0.005034901162197928+-0.0039187423783939475
chi2/ndof = 0.00023706785497299712