FROM TH2F
constant
0.022434259132712846+-0.016151268625510695
chi2/ndof = 0.0021847406826866955
plane
0.016625005750705434+-0.03943450601467215
invpt slope = 0.00287159979102897+-0.024728035934594876
theta slope = 0.003676989500373054+-0.039750767709336096
chi2/ndof = 0.0019200766338242168
from tgraph2D
constant
0.024501725642659518+-0.0006517218838611663
chi2/ndof = 4.459784845978459e-05
plane
0.018053786298906003+-0.0011931158618288381
invpt slope = 0.0018181260070818021+-0.0006841555447411282
theta slope = 0.006764156614897225+-0.00136072607901099
chi2/ndof = 3.24282597758905e-05